JOURNAL OF COMBINATORIAL THEORY SERIES A, vol. 113, no. 8, page. 1805 - 1820, 2006-11
EUROPEAN JOURNAL OF COMBINATORICS, vol. 27, no. 5, page. 669 - 689, 2006-07
EUROPEAN JOURNAL OF COMBINATORICS, vol. 27, no. 1, page. 79 - 89, 2006-01