	Authors	Year	Title
	Bultynck_&_Walliser & Walliser	1991	Proposal for the Eifelian/Givetian Stratotype in Southern Morocco. Document submitted Subcommission Devonian Stratigraphy Frankfurt 1990, 3 pp.
	Walliser, Bultynck_&_Walliser & Weddige	1995	Definition of the Eifelian-Givetian Stage boundary. (O.H.Walliser, P. Bultynck, K. Weddige, R.T. Becker & M.R. House) Episodes, 18 (3): 107-115, 6 figs.