@article{KUKTF_1987_6_6_a5,
     author = {O. E. Tikhonov},
     title = {Convex functions and inequalities for a~trace},
     journal = {Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz},
     pages = {77--82},
     year = {1987},
     volume = {6},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKTF_1987_6_6_a5/}
}