SIAM JOURNAL ON DISCRETE MATHEMATICS, vol. 25, no. 4, page. 1902 - 1919, 2011-12
APPLIED MATHEMATICS LETTERS, vol. 21, no. 12, page. 1306 - 1309, 2008-12
EUROPEAN JOURNAL OF COMBINATORICS, vol. 29, no. 7, page. 1617 - 1633, 2008-10
ELECTRONIC JOURNAL OF COMBINATORICS, vol. 15, no. 1, 2008-03-20
DISCRETE & COMPUTATIONAL GEOMETRY, vol. 38, no. 3, page. 605 - 614, 2007-10