Degree Problems for Modular Machines. - Daniel E. Cohen (J. Symb. Log., 1980)

Modular machines, undecidability and incompleteness. - Daniel E. Cohen (Logic and Machines, 1983)

Closure Relations, Buchberger's Algorithm, and Polynomials in Infinitely Many Variables. - Daniel E. Cohen (Computation Theory and Logic, 1987)

Isodiametric and isoperimetric inequalities for Group Presentations. - Daniel E. Cohen (Int. J. Algebra Comput., 1991)

Separating the Intrinsic Complexity and the Derivational complexity of the Word Problem for Finitely Presented Groups. - Friedrich Otto; Daniel E. Cohen; Klaus Madlener (Math. Log. Q., 1993)

String Rewriting and Homology of Monoids. - Daniel E. Cohen (Math. Struct. Comput. Sci., 1997)