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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.

Jones, Dixon J.
The periambic constellation: Altitudes, perpendicular bisectors, and other radical axes in a triangle, 17 (2017) 383--399.

Jorge, Maricarmen C.
(with C. E. Garza and A. Olvera) Areas and shapes of planar irregular polygons, 18 (2018) 17--36.

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.