@article{RM_1974_29_4_a16,
     author = {V. P. Maslov and A. I. Shishmarev},
     title = {The symbols of one-parameter semigroups~$e^{tA}$ as $t\to 0$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1974_29_4_a16/}
}