@article{FAA_1981_15_4_a17,
     author = {\`E. R. Tsekanovskii},
     title = {Friedrichs and {Krein} extensions of positive operators and holomorphic contraction semigroups},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {91--92},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1981_15_4_a17/}
}