Bordulyak, M. T., and M. M. Sheremeta. “On the Existence of Entire Functions of Bounded L-Index and L-Regular Growth”. Ukrains’kyi Matematychnyi Zhurnal, vol. 48, no. 9, Sept. 1996, pp. 1166–1182, https://umj.imath.kiev.ua/index.php/umj/article/view/5232.