Mladenov, Ivaïlo M. (ed.) et al., Proceedings of the 20th international conference on geometry, integrability and quantization, Sts. Constantine and Elena (near Varna), Bulgaria, June 2–7, 2018. Sofia: Avangard Prima; Sofia: Bulgarian Academy of Sciences, Institute of Biophysics and Biomedical Engineering. Geom. Integrability Quantization 20, 99-114 (2019).
Gopal, T. V. (ed.) et al., Theory and applications of models of computation. 14th annual conference, TAMC 2017, Bern, Switzerland, April 20–22, 2017. Proceedings. Cham: Springer. Lect. Notes Comput. Sci. 10185, 373-388 (2017).
Gruber, Bruno (ed.), Symmetries in science VI: From the rotation group to quantum algebras. Proceedings of a symposium held in Bregenz, Austria, August 2-7, 1992. New York, NY: Plenum Press. 247-253 (1993).