ADVANCES IN MATHEMATICS, vol. 213, no. 2, page. 865 - 886, 2007-08-20
EUROPEAN JOURNAL OF COMBINATORICS, vol. 28, no. 1, page. 228 - 245, 2007-01
LINEAR ALGEBRA AND ITS APPLICATIONS, vol. 418, no. 1, page. 234 - 256, 2006-10-01