@article{IM2_1970_4_1_a9,
     author = {A. V. Strauss},
     title = {Extensions and generalized resolvents of a symmetric operator which is not densely defined},
     journal = {Izvestiya. Mathematics },
     pages = {179--208},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_1_a9/}
}