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    Jackson, Frank M.
      Soddyian triangles, 13 (2013) 1--6.
      (with S. Takhaev) Heronian triangles of class K: a congruent incircles perspective, 15 (2015) 5--12.
    Janicic, Predrag
      Wernick's list: a final update, 3 (2016) 69--80.
    Janous, Walther
      Further inequalities of Erdos-Mordell type, 4 (2004) 203--206.
    Jiang, Wei-Dong
      An inequality involving the angle bisectors and an interior point of a triangle, 8 (2008) 73--76.
    Josefsson, Martin
      On the inradius of a tangential quadrilateral, 10 (2010) 27--34.
      Calculations concerning the tangent lengths and tangency chords of a tangential quadrilateral, 10 (2010) 119--130.
      Characterizations of bicentric quadrilaterals, 10 (2010) 165--173.
      More characterizations of tangential quadrilaterals, 11 (2011) 65--82.
      The area of a bicentric quadrilateral, 11 (2011) 155--164.
      When is a tangential quadrilateral a kite? 11 (2011) 165--174.
      The area of the diagonal point triangle, 11 (2011) 213--216.
      Characterizations of orthodiagonal quadrilaterals, 12 (2012) 13--25.
      Similar metric characterizations of tangential and extangential quadrilaterals, 12 (2012) 63--77.
      A new proof of Yun's inequality or bicentric quadrilaterals, 12 (2012) 79--82.
      Maximal area of a bicentric quadrilateral, 12 (2012) 237--241.
      Five proofs of an area characterization of rectangles, 13 (2013) 17--21.
      Characterizations of trapezoids, 13 (2013) 23--35.
      Angle and circle characterizations of tangential quadrilaterals, 14 (2014) 1--13.
      Properties of equidiagonal quadrilaterals, 14 (2014) 129--144.
      The diagonal point triangle revisited, 14 (2014) 381--385.