@article{SJVM_2007_10_1_a5,
     author = {V. V. Smelov},
     title = {Approximation of piecewise smooth functions by a~small binary basis from eigenfunctions of the two {Sturm--Liouville} problems under mutually symmetric boundary conditions},
     journal = {Sibirskij \v{z}urnal vy\v{c}islitelʹnoj matematiki},
     pages = {89--104},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJVM_2007_10_1_a5/}
}