Rudolf Freund, Franziska Freund. Test tube systems: when two tubes are enough. In Grzegorz Rozenberg, Wolfgang Thomas, editors, Developments in Language Theory, Foundations, Applications, and Perspectives, Aachen, Germany, 6-9 July 1999. pages 338-350, World Scientific, 1999.
@inproceedings{FreundF99, title = {Test tube systems: when two tubes are enough}, author = {Rudolf Freund and Franziska Freund}, year = {1999}, tags = {testing}, researchr = {https://researchr.org/publication/FreundF99}, cites = {0}, citedby = {0}, pages = {338-350}, booktitle = {Developments in Language Theory, Foundations, Applications, and Perspectives, Aachen, Germany, 6-9 July 1999}, editor = {Grzegorz Rozenberg and Wolfgang Thomas}, publisher = {World Scientific}, isbn = {981-02-4380-4}, }