Bakan, A. G. “On the Completeness of Algebraic Polynomials in the Spaces $L_p (ℝ, dμ)$”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 61, no. 3, Mar. 2009, pp. 291-0, https://umj.imath.kiev.ua/index.php/umj/article/view/3020.