"Gleichwertigkeit." . . "Topologie combinatoire." . . "Kombinatorische Einbettung." . . "Noeud, théorie du." . . . . "Combinatorial imbeddings"@en . . . . "On the structure of certain semigroups of spherical knot classes" . . . . . "The Definition of Equivalence of combinatorial Imbeddings : On the Structure of certain Semi-Groups of Spherical Knot Classes : Orthotopy and Spherical Knots" . "The definition of equivalence of combinatorial imbeddings"@en . . . "Equivalence"@en . . . "The definition of equivalence of combinatorial imbeddings : On the structure of certain semi-groups of sphorical knot classes. Orthotopy and spherical knots"@en . "The definition of equivalence of combinatorial imbeddings : On the structure of certain semi-groups of spherical knot classes : Orthopty and spherical knots"@en . . "The Definition of equivalence of combinatorial imbeddings : On the structure of certain semigroups of spherical knot classes : Orthotopy and spherical knots" . . . . . "The definition of equivalence of combinatorial imbeddings. On the structure of certain semigroups of spherical knot classes. Orthotopy and spherical knots" . . . .