H. Petersen On the Determinacy Problem for Two-Way Pushdown Automata. [Citation Graph (0, 0)][DBLP] Inf. Process. Lett., 1994, v:52, n:6, pp:323-324 [Journal]

H. Petersen On Space Functions Fully Constructed by Two-Dimensional Turing Machines. [Citation Graph (0, 0)][DBLP] Inf. Process. Lett., 1995, v:54, n:1, pp:9-10 [Journal]

H. Petersen A Remark on a Paper by Armando B. Matos. [Citation Graph (0, 0)][DBLP] Theor. Comput. Sci., 1995, v:141, n:1&2, pp:329-330 [Journal]