Sefer ko'aḥ ha-avanim = on the virtue of the stones : Hebrew text and English translation : with a lexicological analysis of the romance terminology and source study / Berakhyah Ben Natronai ha-Nakdan ; edited, translated, and annotated by Gerrit Bos and Julia Zwink.    Leiden ; Boston : Brill, 2010 . x, 187 stran