Proceedings - Mathematical Sciences
Proceedings - Mathematical Sciences > 2007 > 117 > 4 > 545-554
Proceedings - Mathematical Sciences > 2010 > 120 > 2 > 249-258
Proceedings - Mathematical Sciences > 2014 > 124 > 1 > 67-79
Proceedings - Mathematical Sciences > 2007 > 117 > 4 > 545-554
Proceedings - Mathematical Sciences > 2010 > 120 > 2 > 249-258
Proceedings - Mathematical Sciences > 2014 > 124 > 1 > 67-79