JOURNAL OF COMBINATORIAL THEORY SERIES A, vol. 119, no. 4, page. 904 - 922, 2012-05
JOURNAL OF COMBINATORIAL THEORY SERIES A, vol. 119, no. 3, page. 546 - 555, 2012-04
EUROPEAN JOURNAL OF COMBINATORICS, vol. 30, no. 3, page. 668 - 673, 2009-04