We thank A. K. Fedorov, V. Kasper, A. Maitra, Y. E.
Shchadilova, and A. Sykes for careful reading of the
manuscript. The work of O. G., V. V. C., and M. B. Z. is
part of the Delta ITP consortium, a program of the
Netherlands Organisation for Scientific Research (NWO)
that is funded by the Dutch Ministry of Education, Culture
and Science (OCW). The work of O. G. was partially
supported by Project No. 1/30-2015 “Dynamics and
topological structures in Bose-Einstein condensates of
ultracold gases” of the KNU Branch Target Training at
the NAS of Ukraine. E. B. acknowledges support by Grant
No. 14-21-00158 from the Russian Science Foundation.
O. L. acknowledges the support from the Russian
Foundation for Basic Research under Grant No. 16-32-00669. The work of M. B. Z. is supported by Grant
No. ANR-16-CE91-0009-01.
Received: 01.09.2017 Revised: 02.03.2018
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