ELA articles which reference this paper are

Simone Severini; Ferenc Szollosi
A further look into combinatorial orthogonality,
Electron. J. Linear Algebra 17 (2008), 376-388.

Dragomir Z. Djokovic; Simone Severini; Ferenc Szollosi
Rational orthogonal versus real orthogonal,
Electron. J. Linear Algebra 18 (2009), 649-673.