@article{FPM_1997_3_1_a0,
     author = {V. G. Boltyanskii},
     title = {The tents method and the theory of extremum},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {3--13},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1997_3_1_a0/}
}