Bogdanskii, Yu. V., and Ya. Yu. Sanzharevskii. 2014. “The Dirichlet Problem With Laplacian With Respect to a Measure in the Hilbert Space”. Ukrains’kyi Matematychnyi Zhurnal 66 (6), 733–739. https://umj.imath.kiev.ua/index.php/umj/article/view/2174.