1. Generalization of a theorem of Hayman's on a subharmonic function in an $n$-dimensional cone (Russian),;V. S. Azarin;Mat. Sb. (N.S.),1965
2. Elliptic Partial Differential Equations of Second Order,;D. Gilbarg;Springer-Verlag,2001
3. On an upper bound of the module of a function analytic in a half-plane and in a plane with a cut (Russian),;N. V. Govorov;Izv. Severo-Kavkaz. Nauchn. Tsentra Vyssh. Shkoly Estestv. Nauk.,1973
4. Ordinary Differential Equations,;P. Hartman;John Wiley & Sons,1964
5. Growth of Schrödingerian subharmonic functions admitting certain lower bounds,;A. I. Kheyfits;Advances in Harmonic Analysis and Operator Theory,2013