Geodesic
Sharp constants and extremal functions in inequalities for derivatives
Matematičeskie zametki, Tome 41 (1987) no. 2, pp. 159-174 
A. P. Buslaev. Sharp constants and extremal functions in inequalities for derivatives. Matematičeskie zametki, Tome 41 (1987) no. 2, pp. 159-174. http://geodesic.mathdoc.fr/item/MZM_1987_41_2_a4/
@article{MZM_1987_41_2_a4,
     author = {A. P. Buslaev},
     title = {Sharp constants and extremal functions in inequalities for derivatives},
     journal = {Matemati\v{c}eskie zametki},
     pages = {159--174},
     year = {1987},
     volume = {41},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_2_a4/}
}
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