A Description of solutions of quadratic equations in hyperbolic Groups. - Rostislav I. Grigorchuk; I. G. Lysionok (Int. J. Algebra Comput., 1992)

Defining Relations and the Algebraic Structure of the Group SL2 over Integral Hamilton Quaternions. - Sergei I. Adian; I. G. Lysionok; J. G. Mennicke (Int. J. Algebra Comput., 1997)