@inproceedings{mvf01,
   author    = {Macià, H. and Valero,V. and de Frutos-Escrig,D.},
   title     = {sPBC: A Markovian  Extension of finite PBC},
   booktitle = {IX Jornadas de Concurrencia},
   address   = {Sitges,  (Spain)}
   pages     = {243-256},
   year      = {2001},
   month     = {June}
}