Semenyshyna, I. V., and Y. V. Teplinsky. “On the Cauchy Problem for Degenerate Difference Equations of the <em class="a-Plus-plus">m</em&gt;Th Order in a Banach Space”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 55, no. 8, Aug. 2003, pp. 1127-3, https://umj.imath.kiev.ua/index.php/umj/article/view/3986.