LINEAR ALGEBRA AND ITS APPLICATIONS, vol. 429, no. 11-12, page. 2678 - 2686, 2008-12-01
EUROPEAN JOURNAL OF COMBINATORICS, vol. 30, no. 3, page. 638 - 654, 2009-04
JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, vol. 635, page. 213 - 235, 2009-10
EUROPEAN JOURNAL OF COMBINATORICS, vol. 28, no. 7, page. 2026 - 2052, 2007-10