Alexandru Cârstea Georgiana Macariu Dana Petcu Alexander Konovalov Pattern Based Composition of Web Services for Symbolic Computations. 126-135 2008 ICCS (1) http://dx.doi.org/10.1007/978-3-540-69384-0_18 conf/iccS/2008-1 db/conf/iccS/iccS2008-1.html#CarsteaMPK08