@article{LKN_2014_23_23_a0,
     author = {A. G. Sergeev},
     title = {Lectures on functional analysis},
     journal = {Lekcionnye kursy NOC},
     pages = {3--101},
     year = {2014},
     volume = {23},
     number = {23},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/LKN_2014_23_23_a0/}
}