1. Bruno, A.D.: Theory of Normal Forms of the Euler–Poisson Equations. Preprint No. 100, Keldysh Institute for Applied Mathematics of RAS, Moscow (2005),
http://library.keldysh.ru/preprint.asp?lg=e&id=2005-100
(abstract),
http://dl.dropbox.com/u/59058738/Preprint100.pdf
(full text in Russian)
2. Golubev, V.V.: Lectures on the Integration of the Equation of Motion of a Rigid Body about of Fixed Point. Gostehizdat, Moscow (1953) (in Russian)
3. NSF Israel Program for Scientific Translations, Washington (1960) (in English)
4. Bruno, A.D.: Power Geometry in Algebraic and Differential Equations. Nauka, Moscow (1998); Elsevier, Amsterdam (2000)
5. Edneral, V.F., Khanin, R.: Application of the resonant normal form to high order nonlinear ODEs using MATHEMATICA. Nuclear Instruments and Methods in Physics Research A 502(2-3), 643–645 (2003)