Citation: M. Faierman et M. Moller, On the essential spectrum of a differentially rotating star in the axisymmetric case, P RS EDIN A, 130, 2000, pp. 1-23
Citation: M. Faierman et al., The essential spectrum of a system of singular ordinary differential operators of mixed order. Part II: The generalization of Kako's problem, MATH NACHR, 209, 2000, pp. 55-81
Citation: M. Faierman et al., The essential spectrum of a system of singular ordinary differential operators of mixed order. Part I: The general problem and an almost regular case, MATH NACHR, 208, 1999, pp. 101-115