@ARTICLE{Dolog:ChangeByAspect,
   author = "Peter Dolog and Valentino Vraniĉ and Mária Bieliková",
   title = "Representing Change by Aspect",
   journal = "ACM SIGPLAN Notices",
   year = 2001,
   month = dec,
   number = 12,
   volume = 36   
}