** 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. **

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

**
**** 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.**

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