**Dalcin****, Mario **

**Isotomic inscribed
triangles and their residuals, 3 (2003) 125--134. **

**Danneels****, Eric **

**A simple construction of the congruent isoscelizers point, 4 (2004) 69--71. The intouch
triangle and the OI-line, 4 (2004) 125--134. (with
N. Dergiades) A theorem on orthology
centers, 4 (2004) 135--141. A
simple construction of a triangle from its centroid, incenter,
and a vertex, 5 (2005) 53--56. The
Eppstein centers and the Kenmotu
points, 5 (2005) 173--180. A
simple perspectivity, 6 (2006) 199--203. On triangles with vertices on the
angle bisectors, 6 (2006) 247--253. (with F.
M. van Lamoen) Midcircles
and the arbelos, 7 (2007) 53--65. **

**Dao, Thanh Oai
**

**A simple proof of Gibert's
generalization of the Lester circle theorem, 14 (2014) 123--125.
Two pairs of Archimedean circles in
the arbelos, 14 (2014) 201--202.
Equilateral triangles and Kiepert perspectors in complex
numbers, 15 (2015) 105--114.
Some golden sections in the
equilateral and right isosceles triangles, 16 (2016) 269--272.
(with T. D. Nguyen and N. M. Pham) A strengthened version of the Erdos-Mordell inequality, 16 (2016) 317--321.**

**De Bruyn,
Bart **

**On a problem regarding the n-sectors of
a triangle, 5 (2005) 47--52. **

**De la Cruz, Jose **

**(with J. F.
Goehl, Jr) Two interesting integer
parameters of integer-sided triangles, 17 (2017) 411--417. **

**Dean, Kean **

**(with F. M.
van Lamoen) Geometric
construction of reciprocal conjugations, 1 (2001) 115--120. **

**Demirel****, Oğuzhan**

**
The first sharp gyrotriangle inequality in Möbius
gyrovector space (D, oplus,
otimes), 17 (2017) 439—447.**

**Dergiades****, Nikolaos **

**The Gergonne
problem, 1 (2001) 75--79. An
elementary proof of the isoperimetric inequality, 2 (2002) 129--130. The perimeter of a cevian triangle, 2 (2002) 131--134. (with J. C. Salazar) Harcourt's theorem, 3 (2003)
117--124. (with F. M. van Lamoen)
Rectangles attached to the sides of
a triangle, 3 (2003) 145--159. (with P. Yiu) Antiparallels
and concurrency of Euler lines, 4 (2004) 1--20. Signed distances and the Erdos-Mordell inequality, 4 (2004) 67--68. (with E. Danneels) A theorem on orthology
centers, 4 (2004) 135--141. (with M. H.
Nguyen) Garfunkel's inequality, 4
(2004) 153--156. A synthetic
proof and generalization of Bellavitis' theorem, 6
(2006) 225--227. (with H. Connelly and J.-P. Ehrmann) Construction
of triangle from a vertex and the feet of two angle bisectors, 7 (2007)
103--106. The Soddy circles, 7
(2007) 191--197. A simple barycentric coordinates formula, 9 (2009) 225--228. (with J. C. Salazar) Some triangle centers associated with
the tritangent circles, 9 (2009) 259--270. Conics tangent at the vertices to
two sides of a triangle, 10 (2010) 41--53. Construction with inscribed
ellipses in a triangle, 10 (2010) 141--148. (with
P. Yiu) The golden section with a
collapsible compass only, 11 (2011) 255--259. (with
F. J. Garcia Capitan and S. H. Lim) On
six circumcenters and their concyclicity, 11
(2011) 269--275. Harmonic
conjugate circles relative to a triangle, 12 (2012) 153--159. (with D. Banerjee) Alhazen's
circular billiard problem, 12 (2012) 193--196. (with
S. H. Lim) The butterfly theorem
revisited, 12 (2012) 301--304. (with A. Myakishev) A
triad of circles tangent internally to the nine-point circle, 13 (2013)
7--10.
Special inscribed trapezoids in a
triangle, 13 (2013) 165--167.
Antirhombi,
14 (2014) 163--171.
Dao's theorem on six circumcenters
associated with a cyclic hexagon, 14 (2014) 243--246.
Generalized Archimedean arbelos twins, 14 (2014) 409--418.
Generalized Tucker circles, 15
(2015) 1--4.
Construction of Ajima
circles via centers of similitude, 15 (2015) 203--209.
Geogebra
construction of the roots of quadratic, cubic and quartic equations, 16
(2016) 29--35.
(with Dimitri M. Christodoulou) The two incenters
of an arbitrary convex quadrilateral, 17 (2017) 245--254. **

**Dixit, Atul
**

**(with D. Grinberg) Orthopoles and the Pappus
theorem, 4 (2004) 53--59. **

**Donolato****, Cesare **

**A vector-based proof of Morley's trisector theorem, 13 (2013) 233--235; corrigendum, 13 (2013) 236.
A proof of the butterfly theorem
using Ceva's theorem, 16 (2016) 185--186.**

**Dosa****, Tibor **

**Some triangle centers associated with
the excircles, 7 (2007) 151--158. **

**Dutta, Surajit
**

**A simple property of isosceles
triangles with applications, 14 (2014) 237--240.**