@article{EJDE_2001__2001__a37,
     author = {Zhidkov, Peter E.},
     title = {Sufficient conditions for functions to form {Riesz} bases in $L_2$ and applications to nonlinear boundary-value problems},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2001},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a37/}
}