S. Suzuki Erazo, and J. Knippers. Protocols, Flows, and Glitches – Proceedings of the 22nd CAADRIA Conference, Suzhou, China, Xian Jiaotong-Liverpool University, (2016)
T. Speck, and J. Knippers. volume 82 of Stuttgarter Beiträge zur Naturkunde, Serie C, page 110-111. Staatliches Museum für Naturkunde Stuttgart, Stuttgart, (2017)
J. Knippers, and T. Speck. volume 82 of Stuttgarter Beiträge zur Naturkunde, Serie C, page 6 – 9. Staatliches Museum für Naturkunde Stuttgart, Stuttgart, (2017)