The Logarithmic Alternation Hierarchiy Collapses: A Sigma^C_2 = A Pi^C_2. - Klaus-Jörn Lange; Birgit Jenner; Bernd Kirsig (ICALP, 1987)

Separation with the Ruzzo, Simon, and Tompa Relativization Implies DSPACE(log n) != NSPACE(log n). - Bernd Kirsig; Klaus-Jörn Lange (Inf. Process. Lett., 1987)

Characterizing The Polynomial Hierarchy by Alternating Auxiliary Pushdown Automata. - Birgit Jenner; Bernd Kirsig (RAIRO Theor. Informatics Appl., 1989)

Alternierung und logarithmischer Platz. - Birgit Jenner; Bernd Kirsig (1989)

The Logarithmic Alternation Hierarchy Collapses: A∑2L = A∏2L. - Birgit Jenner; Bernd Kirsig; Klaus-Jörn Lange (Inf. Comput., 1989)

A Relation Between Sparse and Printable Sets in NSPACE(log n). - Bernd Kirsig (Foundations of Computer Science: Potential - Theory - Cognition, 1997)