@article{RM_1971_26_2_a10,
     author = {L. G\r{a}rding},
     title = {Sharp fronts and lacunas},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1971},
     volume = {26},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_2_a10/}
}