@article{SM_2017_208_2_a0,
     author = {D. I. Borisov and M. Znojil},
     title = {On eigenvalues of a~$\mathscr{P\!T}$-symmetric operator in a~thin layer},
     journal = {Sbornik. Mathematics},
     pages = {173--199},
     publisher = {mathdoc},
     volume = {208},
     number = {2},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2017_208_2_a0/}
}