4 literature references for Hyophila regnellii C. Müller ex Ångström, 1876:

Author: Jaeger
Year: 1872
Source: Ber. Thatigk. St. Gallischen Naturwiss. Ges.
Author: Crosby, M. R. and others - INSUFFICIENT
Year: 1999
Title: INSUFFICIENTLY known because not REVISED since its pre-1963 publication; that is to say we have no more information about the species than Index Muscorum; merely relisted without additional specimens in a checklist since 1963; may have been treated in
Source: Checklist Mosses
Author: W. P. Schimper in Bescherelle
Year: 1872
Source: Mem. Soc. Sci. Nat. Cherbourg
Author: C. Müller ex Ångström
Year: 1876
Source: Ofvers. Forh. Kongl. Svenska Vetensk.-Akad.