Basis property of subsystems of eigen- and associated vectors of a self-adjoint operator pencil
A. S. Markus, V. I. Matsaev

This publication is cited in the following articles:

1. K. A. Radomirskaya, “Spektralnye i nachalno-kraevye zadachi sopryazheniya”, Trudy Krymskoi osennei matematicheskoi shkoly-simpoziuma, SMFN, 63, no. 2, Rossiiskii universitet druzhby narodov, M., 2017, 316–339      
2. A. Levichev, “On causal structure of homogeneous Lorentzian manifolds”, Gen Relat Gravit, 21:10 (1989), 1027  
3. A. S. Markus, V. I. Matsaev, “On the basis property for a certain part of the eigenvectors and associated vectors of a selfadjoint operator pencil”, Math. USSR-Sb., 61:2 (1988), 289–307