1. Studies of oxygen groups in bituminous coal;Ihnatowicz;Pr. Gl. Inst. Gorn. Komun.,1952
2. Laboratory tests for the purpose of projecting flotation of coal;Iskra;Przegl. Górn.,1971
3. Flotation of coals of various coalification degree by use of synthetic terpene frothing agents;Jasieńko;Przegl. Górn.,1970
4. Studies on flotation of bituminous coals of various coalification degree. I Flotation of middle rank coals;Jasieńko;Chem. Stosow.,1971
5. Studies on flotation of bituminous coals of various coalification degree. II Flotation of low rank coals;Jasieńko;Chem. Stosow.,1971