1. Bless MJM, Streel M (1976) The occurrence of reworked miospores in a Westphalian C microflora from South Limburg (The Netherlands) and its bearing on paleogeography. Meded. Rijks Geol Dienst Nieuwe Ser 27–1:1–39
2. Bless MJM, Bouckaert J, Calver M, Graulich J, Paproth E (1977) Paleogeography of upper Westphalian deposits in N.W. Europe with reference to the Westphalian C North of the mobile variscan belt. Meded Rijks Geol Dienst 28:102–147
3. Bless MJM, Bouckaert J, Conil R, Groessens E, Kasig W, Paproth E, Poty E, Steenwinkel M, Steel M, Walter R (1980) Pre-permian depositional environments around the Brabant Massif in Belgium, The Netherlands and Germany. Sed Geol 27:1–81
4. Bless MJM, Bouckaert J, Paproth E (1983) Recent exploration in pre-Permian rocks around the Brabant Massif in Belgium, The Netherlands and the Federal Republic of Germany. In: Kaasschieter JPH, Reijers TJA (Eds.). Petroleum geology of the southeastern North Sea and the adjacent onshore areas (The Hague, 1982)—Geologie en Mijnbouw 62: 51–062
5. Burger K (1985) Kohlentonesteine im Oberkarbon NW-Europas ein Beitrag zur Geochronologie. Compte rendu 10e Congrès Internationale de Stratigraphie et de Géologie Carbonifère (Madrid, 1983) 3: 433–447