The Spectral Function for Some Products of Self-Adjoint Operators
M. S. Denisov

References
1.	H. Langer, Math. Nachr., 33:1–2 (1967), 107–120
2.	T. Ya. Azizov, I. S. Iokhvidov, Osnovy teorii lineinykh operatorov v prostranstvakh s indefinitnoi metrikoi, Nauka, M., 1986
3.	J. Bognár, Acta Sci. Math. (Szeged), 45:1–4 (1983), 75–80
4.	A. I. Plesner, Spektralnaya teoriya lineinykh operatorov, Nauka, M., 1965