Geodesic
Uniform-metric nonlinear approximation of functions from Besov--Lorentz spaces
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 11, Tome 204 (1993), pp. 61-81

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A number of results on a nonlinear approximation in the uniform metric of functions in Besov–Lorentz spaces by means of their approximation by $\varphi$-polynomials and, in particular, by rational functions and splines, is obtained. Bibliography: 11 titles. 
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     author = {Yu. V. Netrusov},
     title = {Uniform-metric nonlinear approximation of functions from {Besov--Lorentz} spaces},
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     volume = {204},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_1993_204_a4/}
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Yu. V. Netrusov. Uniform-metric nonlinear approximation of functions from Besov--Lorentz spaces. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 11, Tome 204 (1993), pp. 61-81. http://geodesic.mathdoc.fr/item/ZNSL_1993_204_a4/