@article{IVM_1987_7_a9,
     author = {Yu. V. Trubnikov},
     title = {The {Hanner} inequality and the convergence of iterative processes},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {57--64},
     year = {1987},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_7_a9/}
}