** Calvo, Maria
**
** (with V. Munoz) The most inaccessible point of a convex domain, 13 (2013) 37--52.**

**
**** Celli, Martin
**
** A proof of the butterfly theorem using the similarity factor of the two wings, 16 (2016) 337--338.**

** Convexity and non-differentiable singularities in Mortici's paper on Fermat-Torricelli points, 17 (2017) 115--117.**

**
**** Cerin, Zvonko
**
**Loci related to variable flanks, 2 (2002) 105--113. **

**The vertex-midpoint-centroid triangles, 4 (2004) 97--109. **

**On butterflies inscribed in a quadrilateral, 6 (2006) 241--246. **

**Rings of squares around orthologic triangles, 9 (2009) 57--80. **

**On the Fermat geometric problem, 13 (2013) 135--147.**

**
**** Chern, Shane
**
**Integral right triangle and rhombus pairs with a common area and a common perimeter, 16 (2016) 25--27.**

**
**** Chipalkatti, Jaydeep
**
**On the coincidences of Pascal lines, 16 (2016) 1--21.**

**Pascal's hexagram and the geometry of the Ricochet configuration, 17 (2017) 73--91.**

**
**** Christodoulou, Dmitri M.
**
**Euclidean figures and solids without incircles or inspheres, 16 (2016) 291--298.**

** (with N. Dergiades) The two incenters of an arbitrary convex quadrilateral, 17 (2017) 245--254. **

**Golden elliptical orbits in Newtonian gravitation, 17 (2017) 465--471.**

**
**** Cipu, Mihai
**
**Cyclic quadrilaterals associated with squares, 11 (2011) 223--229. **

**
**** Cohl, Telv
**
** A purely synthetic proof of Dao's theorem on six circumcenters associated with a cyclic hexagon, 14 (2014) 261--264.**

**
**** Connelly, Harold
**
** (with N. Dergiades and J. P. Ehrmann) Construction of triangle from a vertex and the feet of two angle bisectors, 7 (2007) 103--106. **

**An extension of triangle constructions from located points, 9 (2009) 109--112. **

** (with B. Randrianantoanina) An angle bisector parallel applied to triangle construction, 9 (2009) 161--163. **

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