| Publication | Date of Publication | Type |
|---|
| Combinatorial group theory. | 2001-01-17 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3755641 | 1987-01-01 | Paper |
| The word problem for geometrically finite groups | 1986-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3748480 | 1986-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3769070 | 1985-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5186261 | 1985-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3218281 | 1984-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3218302 | 1984-01-01 | Paper |
| Doubly eulerian trails on rectangular grids | 1984-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3344342 | 1984-01-01 | Paper |
| The orbits of the product of two permutations | 1983-01-01 | Paper |
| Infinite Eulerian tessellations | 1983-01-01 | Paper |
| Maximal nonparabolic subgroups of the modular group | 1983-01-01 | Paper |
| Permutations and cubic graphs | 1983-01-01 | Paper |
| Nonparabolic subgroups of the modular group | 1982-01-01 | Paper |
| Commutators in Free Groups | 1981-01-01 | Paper |
| Proof of the Fundamental Theorem of Algebra | 1981-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3333233 | 1980-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q3872653 | 1980-01-01 | Paper |
| Equations in groups | 1980-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4161862 | 1978-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4145882 | 1977-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4097463 | 1976-01-01 | Paper |
| A remark about permutations | 1975-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4047722 | 1974-01-01 | Paper |
| Equivalence of Elements Under Automorphisms of a Free Group | 1974-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q4776067 | 1974-01-01 | Paper |
| Commutators as Products of Squares | 1973-01-01 | Paper |
| Two notes on Rankin's book on the modular group | 1973-01-01 | Paper |
| Products of powers in groups | 1973-01-01 | Paper |
| On the Freiheitssatz | 1972-01-01 | Paper |
| Groups Generated by two Parabolic Linear Fractional Transformations | 1969-01-01 | Paper |
| Pairs of real 2-by-2 matrices that generate free products | 1968-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5572292 | 1968-01-01 | Paper |
| A maximum principle for graphs | 1967-01-01 | Paper |
| Groups of Elliptic Linear Fractional Transformations | 1967-01-01 | Paper |
| On Dehn's algorithm | 1966-01-01 | Paper |
| Dependence in groups | 1966-01-01 | Paper |
| Equations in Free Metabelian Groups | 1966-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5553251 | 1966-01-01 | Paper |
| Grushko's Theorem | 1965-01-01 | Paper |
| Free Bases for Normal Subgroups of Free Groups | 1963-01-01 | Paper |
| Length Functions in Groups. | 1963-01-01 | Paper |
| The equation \(a_ M=b^ Nc^ P\) in a free group | 1962-01-01 | Paper |
| Dependence and Independence in Free Groups. | 1962-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5517669 | 1962-01-01 | Paper |
| Relation algebras and projective geometries | 1961-01-01 | Paper |
| Equations in Free Groups | 1960-01-01 | Paper |
| Groups With Parametric Exponents | 1960-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5599134 | 1960-01-01 | Paper |
| The equation \(a^2b^2=c^2\) in free groups | 1959-01-01 | Paper |
| An interpolation theorem in the predicate calculus | 1959-01-01 | Paper |
| Properties preserved under homomorphism | 1959-01-01 | Paper |
| Properties preserved in subdirect products | 1959-01-01 | Paper |
| Properties preserved under algebraic constructions | 1959-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5555054 | 1959-01-01 | Paper |
| Existential Horn Sentences | 1959-01-01 | Paper |
| Free differential calculus. IV: The quotient groups of the lower central series | 1958-01-01 | Paper |
| Free differential calculus. IV: The quotient groups of the lower central series | 1958-01-01 | Paper |
| A theorem of Friedrichs | 1956-01-01 | Paper |
| The representation of relation algebras. II | 1956-01-01 | Paper |
| On Burnside's Problem. II | 1955-01-01 | Paper |
| Commutator Subgroups of Free Groups | 1955-01-01 | Paper |
| Identities in Finite Algebras | 1954-01-01 | Paper |
| On Burnside's Problem | 1954-01-01 | Paper |
| https://portal.mardi4nfdi.de/entity/Q5820582 | 1953-01-01 | Paper |
| Two Notes on Nilpotent Groups | 1952-01-01 | Paper |
| Identities in Two-Valued Calculi | 1951-01-01 | Paper |
| The representation of relational algebras | 1950-01-01 | Paper |
| Cohomology theory of groups with a single defining relation | 1950-01-01 | Paper |
| New proof for a theorem of Eilenberg and MacLane | 1949-01-01 | Paper |
| The cohomology theory of group extensions | 1948-01-01 | Paper |
