Geodesic
The representation of measurable functions by usual and multiple series of Legendre polynomials
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1988), pp. 143-146

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The problem of representation of arbitrary functions by nstial and multiple series of Legendre polynomials in the sense of convergence in almost everywhere is considered in the paper. 
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     author = {M. G. Grigoryan},
     title = {The representation of measurable functions by usual and multiple series of {Legendre} polynomials},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {143--146},
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M. G. Grigoryan. The representation of measurable functions by usual and multiple series of Legendre polynomials. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 1 (1988), pp. 143-146. http://geodesic.mathdoc.fr/item/UZERU_1988_1_a12/