@article{FAA_1972_6_1_a3,
     author = {E. A. Lifshits},
     title = {Positively reproducing and positively normal operators},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {19--23},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1972_6_1_a3/}
}