Lubomir Markov, Heronian triangles whose areas are integer multiples of  their perimeters,
Forum Geometriorum, 7 (2007) 129--135.

Abstract: We present an improved algorithm for finding all solutions to Goehl's problem A=mP for triangles, i.e., the problem of finding all Heronian triangles whose area  (A)  is an integer multiple (m) of the perimeter (P). The new algorithm does not involve elimination of extraneous rational triangles, and is a true extension of Goehl's original method.

[ps file][pdf]