@Conference{Sopena-et-al:1999,
    Author = "Sopena, J.~M. and Romero, E. and Alqu\'ezar, R.",
     Title = "{Neural Networks with Periodic and Monotonic Activation Functions: A Comparative Study in Classification Problems}",
 Booktitle = "{International Conference on Artificial Neural Networks}",
      Year = "1999",
     Pages = "323-328",
       Url = "Downloads/1999-icann.ps.gz",
}