- A. V. Tsiganov, “Integrable Deformations of Tops Related to the Algebra so(p,q)”, Theoretical and Mathematical Physics, 141, no. 1, 2004,
1348 
- I. Z. Golubchik, V. V. Sokolov, “Factorization of the Loop Algebra and Integrable Toplike Systems”, Theoretical and Mathematical Physics, 141, no. 1, 2004,
1329