@article{AA_2000_12_3_a4,
     author = {E. A. Riss},
     title = {The positivity principle for equivalent norms},
     journal = {Algebra i analiz},
     pages = {146--172},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2000_12_3_a4/}
}