@article{UFA_2014_6_1_a3,
     author = {D.I. Borisov},
     title = {Discrete spectrum of thin $\mathcal{PT}$-symmetric waveguide},
     journal = {Ufa mathematical journal},
     pages = {29--55},
     year = {2014},
     volume = {6},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2014_6_1_a3/}
}