** Sadek, Jawad
**
** (with M. Bani-Yaghoub and N. H. Rhee) Isogonal conjugates in a tetrahedron, 16
(2016) 43--50. **

** Isogonal conjugates in an n-simplex, 17 (2017) 425--432. **

** Saitoh, Saburou
**
** (with H. Okumura) Remarks for the twin circles of Archimedes in a skewed arbelos, 18 (2018) 99--102.**

**
**** Salazar, Juan Carlos
**
** (with N. Dergiades) Harcourt's theorem, 3 (2003) 117--124. **

**On the areas of the intouch and extouch triangles, 4 (2004) 61--65. **

** (with K. L. Nguyen) On the mixtilinear incircles and excircles, 6 (2006) 1--16. **

** (with N. Dergiades) Some triangle centers associated with the tritangent circles, 9 (2009) 259--270. **

**
**** Sandor, Jozsef
**
**On the geometry of equilateral triangles, 5 (2005) 107--117. **

** (with R. Olah-Gal) On trigonometric proofs of the Steiner-Lehmus theorem, 9 (2009) 155--160. **

**
****Sastry, K. R. S.
**
**Heron triangles: a Gergonne-cevian-and-median perspective, 1 (2001) 17--24. **

**Brahmagupta quadrilaterals, 2 (2002) 167--173. **

**Triangles with special isotomic conjugate pairs, 4 (2004) 73--80. **

**Construction of Brahmagupta n-gons, 5 (2005) 119--126. **

**A Gergonne analogue of the Steiner-Lehmus theorem, 5 (2005) 191--195. **

**Two Brahmagupta problems, 6 (2006) 301--310. **

**
**** Sato, Kenzi
**
**Orthocenters of simplices on spheres, 17 (2017) 301--324. **

**Orthocenters of simplices in hyperbolic spaces, 17 (2017) 483--508. **

**
**** Scheer, Michael J. G.
**
**A simple vector proof of Feuerbach's theorem, 11 (2011) 205--210. **

**
**** Schmidt, Eckart
**
**Circumcenters of residual triangles, 3 (2003) 207--214. **

**
**** Schreck, Pascal
**
**Wernick's list: a final update, 3 (2016) 69--80. **

**
**** Schröder, Eberhard M.
**
**(with J. C. Fisher and J. Stevens) Circle incidence theorems, 15 (2015) 211--228.**

**
**** Scimemi, Benedetto
**
**Paper-folding and Euler's theorem revisited, 2 (2002) 93--104. **

**Simple relations regarding the Steiner inellipse of a triangle, 10 (2010) 55--77. **

**Semi-similar complete quadrangles, 14 (2014) 87--106.**

**
****Searby, David Graham
**
**On three circles, 9 (2009) 181--193. **

**
**** Semiao, Paulo
**
** (with J. Rodriguez and P. Manuel) A conic associated with the Euler line, 6 (2006) 17--23. **

**
**** ShahAli, Hassan Ali
**
**(with S. Abu-Saymeh and M. Hajja) Another variation of the Steiner-Lehmus theme, 8 (2008) 131--140. **

**
**** Shattuck, Mark
**
** (with T. Mansour) On a certain cubic geometric inequality, 11 (2011) 175--181. **

** (with T. Mansour) Improving upon a geometric inequality of third order, 12 (2012) 227--235. **

** Steiner-Lehmus type results related to the Gergonne point of a triangle, 17 (2017) 49--62. **

** (with T. Mansour) Some monotonicity results related to the Fermat point of a triangle, 16 (2016) 355--366. **

**
****Shawyer, Bruce
**
**Some remarkable concurrences, 1 (2001) 69--74. **

**
**** Sigur, Steve
**
**Where are the conjugates? 5 (2005) 1--15. **

**
**** Singer, David A.
**
** (with J. C. Langer) The lemniscatic chessboard, 11 (2011) 183--199. **

**
**** Singhal, Navneel
**
** On the orthogonality of a median and a symmedian, 17 (2017) 203--206. **

**
**** Smith, Geoffrey C.
**
**Statics and the moduli space of triangles, 5 (2005) 181--190. **

** (with C. Bradley) The locations of triangle centers, 6 (2006) 57--70. **

** (with C. Bradley) The locations of the Brocard points, 6 (2006) 71--77. **

** (with C. Bradley and D. Monk) On a porism associated with the Euler and Droz-Farny lines, 7 (2007) 11--17. **

** (with C. Bradley) On a construction of Hagge, 7 (2007) 231--247. **

**
****Soldatos, Gerssimos T.
**
**A toroidal approach to the Archimedean quadrature, 17 (2017) 13--15. **

**A toroidal approach to the doubling of the cube, 18 (2018) 93--97. **

**
**** Spirova, Margarita
**
** (with M. Hajja) A characterization of the centroid using June Lester's shape function, 6 (2006) 53--55. **

**
****Stern, Joseph
**
**Euler's triangle determination problem, 7 (2007) 1--9. **

**
**** Stevanovic, Marina M.
**
** (with P. B. Petrovic and M. R. Stevanovic) Radii of circles in Apollonius' problem, 17 (2017) 359--372. **

**
**** Stevanovic, Milorad R.
**
**Triangle centers associated with the Malfatti circles, 3 (2003) 83--93. **

**The Apollonius circle and related triangle centers, 3 (2003) 187--195. **

**Two triangle centers associated with the excircles, 3 (2003) 197--203. **

** (with P. B. Petrovic and M. M. Stevanovic) Radii of circles in Apollonius' problem, 17 (2017) 359--372. **

**
**** Stevens, Jan
**
**(with J. C. Fisher and E. M. Schröder) Circle incidence theorems, 15 (2015) 211--228.**

**
****Stothers, Wilson
**
**Grassmann cubics and desmic structures, 6 (2006) 117--138. **

**
**** Stroe, Marian
**
** (with D. Marinescu, M. Monea and M. Opincariu) A sequence of triangles and geometric inequalities, 9 (2009) 291--295. **

**
**** Stupel, Moshe
**
** (with V. Oxman) Why are the side lengths of the squares inscribed in a triangle so close to each other?, 13 (2013) 113--115.**

**
**** Suceava, Bogdan D.
**
** (with W. G. Boskoff) Applications of homogeneous functions to geometric inequalities and identities in the euclidean plane, 5 (2005) 143--148. **

** (with W. G. Boskoff) A projectivity characterized by the Pythagorean relation, 6 (2006) 187--190. **

** (with P. Yiu) The Feuerbach point and Euler lines, 6 (2006) 191--197. **

** (with W. G. Boskoff and L. H. Odom) An elementary view on Gromov hyperbolic spaces, 12 (2012) 283--286. **

** (with W. G. Boskoff and L. Homentcovschi) Gossard's perspector and projective consequences, 13 (2013) 169--184.**

**
**** Svrtan, Dragutin
**
** (with D. Veljan) Non-Euclidean versions of some classical triangle inequalities, 12 (2012) 197--209. **

** (with D. Veljan) Side lengths of Morley triangles and tetrahedra, 17 (2017) 123--142. **

**
****
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