ABSOLUTE RETRACTS IN GRAPHS.HELL P.1974; LECTURE NOTES MATH.; GERM.; DA. 1974; NO 406; PP. 291-301; BIBL. 15 REF.; (GRAPHS AND COMB. PROC. CAP. CONF. GRAPH THEORY COMB.; WASHINGTON; 1973)Conference Paper

AN INTRODUCTION TO THE CATEGORY OF GRAPHSHELL P.1979; ANN. NEW YORK ACAD. SCI.; USA; DA. 1979; VOL. 328; PP. 120-136; BIBL. 58 REF.Article

GRAPHS WITH GIVEN NEIGHBORHOODS. IHELL P.1978; PROBLEMES COMBINATOIRES ET THEORIE DES GRAPHES. CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE. COLLOQUE INTERNATIONAL. 260/1976/ORSAY; FRA; PARIS: CNRS; DA. 1978; PP. 219-223; ABS. FRE; BIBL. 10 REF.Conference Paper

ABSOLUTE PLANAR RETRACTS AND THE FOUR COLOR CONJECTURE.HELL P.1974; J. COMBINATOR. THEORY, B; U.S.A.; DA. 1974; VOL. 17; NO 1; PP. 5-10; BIBL. 5 REF.Article

COUNTEREXAMPLES TO THEOREMS OF MENGER TYPE FOR THE DIAMETERBONDY JA; HELL P.1983; DISCRETE MATHEMATICS; ISSN 0012-365X; NLD; DA. 1983; VOL. 44; NO 2; PP. 217-220; BIBL. 7 REF.Article

AN INTERMEDIATE VALUE THEOREM FOR GRAPHS WITH GIVEN AUTOMORPHISM GROUPHELL P; QUINTAS LV.1979; J. GRAPH THEORY; USA; DA. 1979; VOL. 3; NO 1; PP. 35-41; BIBL. 7 REF.Article

HOMOMORPHISMS OF GRAPHS AND OF THEIR ORIENTATIONS.HELL P; NESETRIL J.1978; MONATSH. MATH.; OESTERR.; DA. 1978; VOL. 85; NO 1; PP. 39-48; BIBL. 7 REF.Article

GRAPH WITH GIVEN ACHROMATIC NUMBER.HELL P; MILLER DJ.1976; DISCRETE MATH.; NETHERL.; DA. 1976; VOL. 16; NO 3; PP. 195-207; BIBL. 11 REF.Article

CORRECTIONS: GENERALIZED RAMSEY THEORY FOR GRAPHS V.HARARY F; HELL P.1975; BULL. LONDON MATH. SOC.; G.B.; DA. 1975; VOL. 7; NO 19; PP. 87-88; BIBL. 2 REF.Article

ON GENERALIZED MATCHING PROBLEMSHELL P; KIRKPATRICK DG.1981; INF. PROCESS. LETT.; ISSN 0020-0190; NLD; DA. 1981; VOL. 12; NO 1; PP. 33-35; BIBL. 15 REF.Article

GRAPHS WITH FORBIDDEN HOMOMORPHIC IMAGESHELL P; MILLER DJ.1979; ANN. NEW YORK ACAD. SCI.; USA; DA. 1979-05; VOL. 319; PP. 270-280; BIBL. 14 REF.Conference Paper

SORTING AND MERGING IN ROUNDSHAEGGKVIST R; HELL P.1982; SIAM JOURNAL ON ALGEBRAIC AND DISCRETE METHODS; ISSN 0196-5212; USA; DA. 1982; VOL. 3; NO 4; PP. 465-473; BIBL. 17 REF.Conference Paper

ANALOGUES OF THE SHANNON CAPACITY OF A GRAPHHELL P; ROBERTS FS.1982; NORTH-HOLL. MATH. STUD.; ISSN 0304-0208; NLD; DA. 1982; VOL. 60; PP. 155-168; BIBL. 44 REF.Article

PARALLEL SORTING WITH CONSTANT TIME FOR COMPARISONSHAEGGKVIST R; HELL P.1981; SIAM J. COMPUT.; ISSN 0097-5397; USA; DA. 1981; VOL. 10; NO 3; PP. 465-472; BIBL. 9 REF.Article

COHOMOMORPHISMS OF GRAPHS AND HYPERGRAPHSHELL P; NESETRIL J.1979; MATH. NACHR.; DDR; DA. 1979; VOL. 87; PP. 53-61; BIBL. 14 REF.Article

ON THE EDGE-SETS OF RIGID AND CORIGID GRAPHSHELL P; NESETRIL J.1979; MATH. NACHR.; DDR; DA. 1979; VOL. 87; PP. 63-69; BIBL. 10 REF.Article

ERGEBNISSE TAXONOMISCHER UNTERSUCHUNGEN DES WOLFES (CANIS LUPUS) IN DEN SLOWAKISCHEN KARPATEN = DONNEES TAXONOMIQUES SUR LE LOUP (C. P.) DANS LES CARPATHES SLOVENESHELL P; PAULE L.1982; FOLIA ZOOL.; ISSN 50601X; CSK; DA. 1982; VOL. 31; NO 3; PP. 255-270; ABS. ENG/RUS; BIBL. 16 REF.Article

ON FORBIDDEN QUOTIENTS AND THE ACHROMATIC NUMBER.HELL P; MILLER DJ.1976; IN: BR. COMB. CONF. 5. PROC.; ABERDEEN; 1975; WINNIPEG; UTILITAS MATHEMATICA; DA. 1976; PP. 283-292; BIBL. 14 REF.Conference Paper

GENERALIZED RAMSEY THEORY FOR GRAPHS. V. THE RAMSEY NUMBER OF A DIGRAPH.HARARY F; HELL P.1974; BULL. LONDON MATH. SOC.; G.B.; DA. 1974; VOL. 6; NO 17; PP. 175-182; BIBL. 12 REF.Article

DIE HOLZSCHLIFF QUALITAET ALS FUNKTION DES STEINPROFILS = LA QUALITE DE PATE DE BOIS EN FONCTION DU PROFIL DES RAPESSCHWEIZER G; PANCUR N; HELL P et al.1980; WOCHENBL. PAPIERFABRIK.; DEU; DA. 1980; VOL. 108; NO 11-12; PP. 361-368; BIBL. 15 REF.Article

COLLECTING AUTOGRAPHS: N-NODE GRAPHS THAT HAVE N-INTEGER SIGNATURESBLOOM GS; HELL P; TAYLOR H et al.1979; ANN. NEW YORK ACAD. SCI.; USA; DA. 1979-05; VOL. 319; PP. 93-102; BIBL. 5 REF.Conference Paper

HOMOMORPHISM INTERPOLATION AND APPROXIMATIONHEDRLIN Z; HELL P; KO CS et al.1982; NORTH-HOLL. MATH. STUD.; ISSN 0304-0208; NLD; DA. 1982; NO 65; PP. 213-227; BIBL. 31 REF.Article

SOME RESULTS ON THE OBERWOLFACH PROBLEM. (DECOMPOSITION OF COMPLETE GRAPHS INTO ISOMORPHIC QUADRATIC FACTORS).HELL P; KOTZIG A; ROSA A et al.1975; AEQUATIONES MATH.; SUISSE; DA. 1975; VOL. 12; NO 1; PP. 1-5; BIBL. 7 REF.Article

Antidirected hamiltonian paths between specified vertices of a tournamentHELL, P; ROSENFELD, M.Discrete applied mathematics. 2002, Vol 117, Num 1-3, pp 87-98, issn 0166-218XArticle

The existence of homomorphisms to oriented cyclesHELL, P; XUDING ZHU.SIAM journal on discrete mathematics (Print). 1995, Vol 8, Num 2, pp 208-222, issn 0895-4801Article