@article{TM_1970_111_a1,
     author = {N. M. Khalfina},
     title = {The minimax character of a complex analogue of the $R^2$-test},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {12--22},
     publisher = {mathdoc},
     volume = {111},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1970_111_a1/}
}