Jean-Pierre Ehrmann, Constructive solution of a generalization
of Steinhaus' problem on partition of a triangle,
Forum Geometricorum, 7 (2007) 187--190.
Abstract: We present a constructive solution to a generalization of Hugo
Steinhaus' problem of partitioning a given triangle, by dropping perpendiculars
from an interior point, into three quadrilaterals whose areas are in prescribed