@article{IVM_2001_6_a1,
     author = {E. I. Bravyi},
     title = {On necessary conditions for the negativity of the {Green} function for a~two-point problem},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {12--22},
     publisher = {mathdoc},
     number = {6},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2001_6_a1/}
}