@article{IVM_1981_3_a9,
     author = {G. S. Shpak},
     title = {Some estimates for functions that, at two points, have prescribed values and values of first derivatives},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {67--71},
     publisher = {mathdoc},
     number = {3},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1981_3_a9/}
}