renco@saske.sk
n.sasanelli@ba.ipp.cnr.it
Peter.Kovacik@uniag.sk
© 2011 M. Renčo, N. Sasanelli, P. Kováčik, published by Slovak Academy of Sciences, Mathematical InstituteThis work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.