\Bibitem{Loz40} \by S.~Lozinski \paper \"Uber singul\"are integrale \jour Sb. Math. \yr 1940 \vol 49 \issue 2 \mathnet{http://mi.mathnet.ru/eng/sm5952} \mathscinet{https://mathscinet.ams.org/mathscinet-getitem?mr=3866} \zmath{https://zbmath.org/?q=an:0023.12807|66.0274.01}