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    Abraham, Hrvoje
      (with V. Kovac) From electrostatic potentials to yet another triangle center, 15 (2015) 73--89.
    Abu-Saymeh, Sadi
      (with M. Hajja) Triangle centers with linear intercepts and linear subangles, 5 (2005) 33--36.
      (with M. Hajja) Some Brocard-like points of a triangle, 5 (2005) 65--74.
      (with M. Hajja) Coincidence of centers for scalene triangles, 7 (2007) 137--146.
      (with M. Hajja and H. A. ShahAli) Another variation of the Steiner-Lehmus theme, 8 (2008) 131--140.
    Akengin, Mehmet Efe
      (with Zeyd Yusuf Koroglu and Yigit Yargic) Three natural homoteties of the nine-point circle, 13 (2013) 209--218.
    Alperin, Roger C.
      A grand tour of pedals of conics, 4 (2004) 143--151.
      The Poncelet pencil of rectangular hyperbolas, 10 (2010) 15--20.
      Solving Euler's triangle problems with Poncelet's pencil, 11 (2011) 121--129.
      Reflections on Poncelet's pencil, 15 (2015) 93--98.
    Alsina, Claudi
      (with R. B. Nelsen) A visual proof of the Erdos-Mordell inequality, 7 (2007) 99--102.
      (with R. B. Nelsen) On the diagonals of a cyclic quadrilateral, 7 (2007) 147--149.
    Altintas, Abdilkadir
      Some collinearities in the heptagonal triangle, 16 (2016) 249--256.
    Anghel, Nicolae
      Minimal chords in angular regions, 4 (2004) 111--115.
      A maximal parallelogram characterization of ovals having circles as orthoptic curves, 10 (2010) 21--25.
    Apostol, Tom M.
      (with M. A. Mnatsakanian) The method of the punctured containers, 7 (2007) 33--52.
      (with M. A. Mnatsakanian) Volumes of solids swept tangentially around cylinders, 15 (2015) 13--44.
      (with M. A. Mnatsakanian) Volumes of solids swept tangentially around general surfaces, 15 (2015) 45--72.
      (with M. A. Mnatsakanian) Topological treatment of Platonic, Archimedean, and related polyhedra, 15 (2015) 243--251.
    Atzema, Eisso J.
      A theorem by Giusto Bellavitis on a class of quadrilaterals, 6 (2006) 181--185.
      An elementary proof of a theorem by Emelyanov, 8 (2008) 201--204.
      On n-sections and reciprocal quadrilaterals, 9 (2009) 1--17.
      On a flawed, 16th-century derivation of Brahmagupta's formula for the area of a cyclic quadrilateral, 15 (2015) 165--179.
    Ayme, Jean-Louis
      Sawayama and Thebault's theorem, 3 (2003) 225--229.
      A purely synthetic proof of the Droz-Farny line theorem, 4 (2004) 219--224.
    Azarian, Mohammed
      A study of Risala al-Watar wa'l Jaib (The Treatise on the Chord and Sine), 15 (2015) 229--242.