\Bibitem{ZhaMukNak81} \by V.~D.~Zhak, V.~A.~Mukhin, V.~E.~Nakoryakov \paper Three-dimensional vortex structures in cavities \jour Prikl. Mekh. Tekh. Fiz. \yr 1981 \vol 22 \issue 2 \pages 54--59 \mathnet{http://mi.mathnet.ru/pmtf5963} \transl \jour J. Appl. Mech. Tech. Phys. \yr 1981 \vol 22 \issue 2 \pages 186--189 \crossref{https://doi.org/10.1007/BF00907943}