DIFFERENTIAL-DIFFERENCE EQUATIONS ASSOCIATED WITH THE FRACTIONAL LAX OPERATORS ArticleAdler V.E., Postnikov V.V.Journal of Physics A: Mathematical and Theoretical. Vol. 44. 2011.
NEUTRAL AND CHARGED MATTER IN EQUILIBRIUM WITH BLACK HOLES ArticleBronnikov K.A., Zaslavskii O.B.Physical Review D - Particles, Fields, Gravitation and Cosmology. Vol. 84. 2011.