Pham, H. B. “Fréchet-Valued Holomorphic Functions on Compact Sets in (DFN)-Spaces”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, no. 11, Nov. 2008, pp. 1578–1584, https://umj.imath.kiev.ua/index.php/umj/article/view/3272.