1. O. A. Isaev, “Introduction to general multiparameter spectral theory,”Spektr. Teor. Operatorov, No. 3, 142–201 (1980).
2. V. N. Kublanovskaya and V. B. Khazanov, “Spectral problems for pencils of polynomial matrices. Methods and algorithms. V”,Zap. Nauchn. Semin. POMI,202, 26–70 (1992).
3. V. N. Kublanovskaya, “On certain factorizations of two-parameter polynomial matrices,”Zap. Nauchn. Semin. POMI,219, 94–116 (1994).
4. V. B. Khazanov, “On spectral properties of λ-matrices,”Zap. Nauchn. Semin. LOMI,111, 180–194 (1981).
5. V. B. Khazanov, “Multiparameter eigenvalue problems: Jordan semilattices of vectors,”Zap. Nauchn. Semin. POMI,219, 213–221 (1994).