@article{ZNSL_1989_179_a19,
     author = {D. Ya. Terman},
     title = {The splitting of {Laplacian} operator eigenvalue in the case of ellipse with cuts},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {173--178},
     year = {1989},
     volume = {179},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1989_179_a19/}
}