Test Tube Systems or How to Bake a DNA Cake. - Rudolf Freund; Franziska Freund (Acta Cybern., 1996)

Test tube systems with controlled applications of rules. - Rudolf Freund; Franziska Freund (ICEC, 1997)

Test tube systems: when two tubes are enough. - Rudolf Freund; Franziska Freund (Developments in Language Theory, 1999)

Molecular Computing with Generalized Homogeneous P-Systems. - Rudolf Freund; Franziska Freund (DNA Computing, 2000)

Generalized Homogeneous P-Systems. - Rudolf Freund; Franziska Freund (Grammars and Automata for String Processing, 2003)

P Systems with Cutting/Recombination Rules Assigned to Membranes. - Franziska Freund; Rudolf Freund; Marion Oswald; Maurice Margenstern; Yurii Rogozhin; Sergey Verlan (Workshop on Membrane Computing, 2003)

Splicing Test Tube Systems and Their Relation to Splicing Membrane Systems. - Franziska Freund; Rudolf Freund; Marion Oswald (Aspects of Molecular Computing, 2004)