author = { Christensen, Carl Johns, Robert J. },

title = { Index filicum Suppl. 6 Pro annis 1976 - 1990 / prep. by R. J. Johns },

publisher = {Koeltz},

isbn = {1900347113},

year = {1996},

address = { Königstein, Ts. },

url = { http://slubdd.de/katalog?TN_libero_mab2 }