1. N. N. Bogolyubov, Izv. Akad. Nauk SSSR, Ser. Fiz.,19 237 (1955).
2. N. N. Bogolyubov and D. V. Shirkov, Introduction to the Theory of Quantized Fields, Interscience (1959).
3. N. N. Bogolyubov, Paper at the International Conference in Seattle (1956).
4. N. N. Bogolyubov, B. V. Medvedev, and M. K. Polivanov, Questions of the Theory of Dispersion Helations [in Russian], Fizmatgiz (1958).
5. R. H. Nevanlinna, Analytic Functions, Springer, Berlin (1970).