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    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.
    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.