Localization of group rings and applications to 2-complexes. Michael N. Dyer — 1987 Commentarii mathematici Helvetici
Groups with no infinite perfect subgroups and aspherical 2-complexes. Michael N. Dyer — 1993 Commentarii mathematici Helvetici
Trees of Homotopy Types of Two-Dimensional CW-Complexes Allan J. Sieradski; Michael N. Dyer — 1973 Commentarii mathematici Helvetici