@incollection{Sul:99b,
  publisher = {Inforec, Bucharest},
  title = {The algebraic counterpart of a symbolic logic of problem solving},
  editors = {Rosca, I. Gh. and Smeureanu, I.},
  author = {Sularia, Mircea},
  year = {1999},
  booktitle = {Information Technology : the Proceedings of the $4^{th}$
               International Symposium of Economic Informatics, May 6-9 1999 },
  pages = {1037--1044},
}