Klimenko, S., Baygozin, D., Baturin, Y., Göbel, M., Nikitin, I., Nikitina, L. and Leonov, A. 2004. Interactive storytelling in virtual environment: educational system "Virtual Planetarium. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie). 5, 5 (Oct. 2004), 10–23.