Stanislav Krajci Rastislav Lencses Jesús Medina Manuel Ojeda-Aciego Peter Vojtás A Similarity-Based Unification Model for Flexible Querying. 263-273 2002 conf/fqas/2002 FQAS http://link.springer.de/link/service/series/0558/bibs/2522/25220263.htm db/conf/fqas/fqas2002.html#KrajciLMOV02