On Universal Traps. - Horst Antelmann; Lothar Budach; Hans-Anton Rollik (J. Inf. Process. Cybern., 1979)

Automaten in planaren Graphen. - Hans-Anton Rollik (Acta Informatica, 1980)

Random Access Machines and Straight-Line Programs. - Friedhelm Meyer auf der Heide; Hans-Anton Rollik (FCT, 1981)