@article{FAA_1975_9_4_a7,
     author = {A. G. Belyi and Yu. A. Semenov},
     title = {Kato's inequality and semigroup product-formulas},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {59--60},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1975_9_4_a7/}
}