1. Ronkin L. I., An Introduction to the Theory of Entire Functions of Several Variables, Amer. Math. Soc., Providence, RI (1974).
2. Maergoiz L. S., Asymptotic Characteristics of Entire Functions and Their Applications in Mathematics and Biophysics, Kluwer Acad. Publ., Dordrecht, Boston, and London (2003).
3. Rockafellar R. T., Convex Analysis, Princeton University Press, Princeton (1970).
4. Maergoiz L. S., Indicator Diagrams of the Entire Function of Several Variables and Some Applications to Summing Multiple Laurent Series [in Russian] [Preprint, No. 311M], Krasnoyarsk Nauch. Tsentr, Krasnoyarsk (2006).
5. Passare M., Sadykov T., and Tsikh A., “Singularities of hypergeometric functions in several variables,” Compositio Math., 141, No. 3, 787–810 (2005).