VarbanetsS. P. 2014. “Generalized Twisted Kloosterman Sum Over <em class="a-Plus-plus">ℤ</em>[<em class="a-Plus-plus">i</Em&gt;]”. Ukrains’kyi Matematychnyi Zhurnal 66 (5), 609–618. https://umj.imath.kiev.ua/index.php/umj/article/view/2163.