Proceedings - Mathematical Sciences
Proceedings - Mathematical Sciences > 2010 > 120 > 2 > 139-140
Proceedings - Mathematical Sciences > 2012 > 122 > 3 > 335-337
Proceedings - Mathematical Sciences > 2013 > 123 > 2 > 239-244
Proceedings - Mathematical Sciences > 2010 > 120 > 2 > 139-140
Proceedings - Mathematical Sciences > 2012 > 122 > 3 > 335-337
Proceedings - Mathematical Sciences > 2013 > 123 > 2 > 239-244