BordulyakM. T. and SheremetaM. M., “On the existence of entire functions of bounded <em class="a-plus-plus">l</em>-index and <em class="a-plus-plus">l</em&gt;-regular growth”, Ukr. Mat. Zhurn., vol. 48, no. 9, pp. 1166–1182, Sep. 1996.