Gatkіn N. G., and Daletskу Yu. L. 1970. “On One Optimality Criterion in Isolating a Weak Additive Signal Against a Background of Random Noise of Arbitrary Nature ”. Ukrains’kyi Matematychnyi Zhurnal 23 (1): 75-81. https://umj.imath.kiev.ua/index.php/umj/article/view/8483.