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Indian Journal of Pure and Applied Mathematics > 2019 > 50 > 4 > 1133-1145
Afrika Matematika > 2017 > 28 > 7-8 > 1167-1183
Discrete Mathematics > 2009 > 309 > 12 > 3830-3842
Discrete Mathematics > 2009 > 309 > 4 > 887-898
Applied Mathematics and Computation > 2008 > 196 > 1 > 353-355