Andersen, Kirsti; Meyer, Henrik, Georg Mohr’s three books and the Gegenübung auf Compendium Euclidis Curiosi, Centaurus 28, 139-144 (1985). ZBL0571.01014. discusses the identity of J.D.S., author of "Gegenübung auf Compendium Euclidis Curiosi (1673)", and are convinced that it is not (as assumed by Bierens de Haan) a pseudonym of Georg Mohr (hence, the real identity seems still open).