C.  Sérgio and Garcia, C., ?Cryptothallus mirabilis Malmb. (Aneuraceae, Hepaticae) in Portugal. New ecological and phytogeographical data?, Haussknechtia Beiheft, vol. 9, pp. 343 - 346, 1999.

P.  Boudier, Bardat, J., and Perrera, S., ?Cryptothallus mirabilis v. Malmborg (Aneuraceae, Hepaticopsida) dans le Perche d'Eve-et-Loire (France)?, Cryptogamie Bryol., vol. 20, pp. 189 - 196, 1999.