DISCRETE MATHEMATICS, vol. 312, no. 19, page. 2958 - 2968, 2012-10-06
DISCRETE MATHEMATICS, vol. 308, no. 18, page. 4116 - 4123, 2008-09-28
IEEE TRANSACTIONS ON INFORMATION THEORY, vol. 51, no. 4, page. 1424 - 1431, 2005-04