See (Åhag et al. 2007, p. 139) and (Khenkin 1990, p. 35). - Åhag, Per; Czyż, Rafał; Lodin, Sam; Wikström, Frank (2007), "Plurisubharmonic extension in non-degenerate analytic polyhedra" (PDF), Universitatis Iagellonicae Acta Mathematica, Fasciculus XLV: 139–145, MR 2453953, Zbl 1176.31010 http://www.emis.de/journals/UIAM/PDF/45-139-145.pdf
(Khenkin 1990, pp. 35–36). - Khenkin, G. M. (1990), "The Method of Complex Integral Representations in Complex Analysis", in Vitushkin, A. G. (ed.), Several Complex Variables I, Encyclopaedia of Mathematical Sciences, vol. 7, Berlin–Heidelberg–New York: Springer-Verlag, pp. 19–116, ISBN 3-540-17004-9, MR 0850491, Zbl 0781.32007 https://archive.org/details/severalcomplexva0000unse/page/19