@article{ZNSL_1973_34_a6,
     author = {L. A. Molotkov},
     title = {On the dispersion equations of layered media with unhard contact on some boundaries},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {103--116},
     year = {1973},
     volume = {34},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1973_34_a6/}
}