1. Zonation palynologique du Bassin Houiller Lorrain;Alpern;Z. Deut. Geol. Ges.,1966
2. Microspore distribution in the coalfield of Britain;Butterworth,1960
3. Distribution and stratigraphic significance of small spore genera in the Upper Carboniferous of the maritime provinces of Canada;Hacquebard,1960
4. Pennsylvanian spores of Illinois and their use in correlation;Kosanke;Illinois State Geol. Surv., Bull.,1950
5. Bassin houiller de la Sarre et de la Lorraine, 3. Description géologique;Pruvost,1934