Geodesic
The orthoprojection widths of some classes of periodic functions of two variables with a~given majorant of the mixed moduli of continuity
Izvestiya. Mathematics , Tome 64 (2000) no. 1, pp. 121-141

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This paper deals with the orthoprojection widths of classes of periodic functions of two variables with a given majorant of the mixed moduli of continuity of order $l$ that contains logarithmic factors as well as powers. In several cases we find the exact orders of the orthoprojection widths of these classes of functions. 
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     author = {N. N. Pustovoitov},
     title = {The orthoprojection widths of some classes of periodic functions of two variables with a~given majorant of the mixed moduli of continuity},
     journal = {Izvestiya. Mathematics },
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2000_64_1_a3/}
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N. N. Pustovoitov. The orthoprojection widths of some classes of periodic functions of two variables with a~given majorant of the mixed moduli of continuity. Izvestiya. Mathematics , Tome 64 (2000) no. 1, pp. 121-141. http://geodesic.mathdoc.fr/item/IM2_2000_64_1_a3/