ON K-CLOSURE OPERATORS IN GRAPHSPLONKA J.1980; COLLOQ. MATH.; POL; DA. 1980 PUBL. 1981; VOL. 43; NO 2; PP. 373-381; BIBL. 1 REF.Article

ON DECOMPOSITION OF A GRAPH INTO THE SUM OF A DIRECT SYSTEM OF GRAPHSPLONKA J.1972; BULL. ACAD. POLON. SCI., SCI. MATH. ASTR. PHYS.; POLOGNE; DA. 1972; VOL. 20; NO 11; PP. 905-908; ABS. RUSSE; BIBL. 2 REF.Serial Issue

ON GAMMA -REGULAR GRAPHSPLONKA J.1982; COLLOQ. MATH.; ISSN 0010-1354; POL; DA. 1982; VOL. 56; NO 1; PP. 131-134Article

ON FORMULAS PRESERVED BY THE SUM OF A DIRECT SYSTEM OF RELATIONAL SYSTEMSHALKOWSKA K; PLONKA J.1978; MATH. NACHR.; DDR; DA. 1978; VOL. 86; PP. 117-120; BIBL. 1 REF.Article

INSTITUTS DE RECHERCHE SCIENTIFIQUE DE L'UNION SOVIETIQUE.WOJNAR J; PLONKA J.1969; NAFTA-POLSKA.; 1969(11), VOL. 25, NUM. 0011, P. 341 A 347Miscellaneous