Presentations of the Amalgamated Free Product of two Infinite Cycles. Donald J. Collins — 1978 Mathematische Annalen
Generation and Presentation of One-Relator Groups with Centre. Donald J. Collins — 1977 Mathematische Zeitschrift
Relations among the squares of the generators of the braid groups. Donald J. Collins — 1994 Inventiones mathematicae
Cohomological dimension and symmetric automorphisms of a free group. Donald J. Collins — 1989 Commentarii mathematici Helvetici
Rescuing the Whitehead Method for Free Products, II: The Algorithm. Heiner Zieschang; Donald J. Collins — 1984 Mathematische Zeitschrift
Rescuing the Whitehead Method for Free Products, I: Peak Reduction. Donald J. Collins; Zieschang Heiner — 1984 Mathematische Zeitschrift
On the Nielsen Method in Free Products with Amalgamated Subgroups. Heiner Zieschang; Donald J. Collins — 1988 Mathematische Zeitschrift