@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},
     year = {2001},
     volume = {2001},
     zbl = {1009.34077},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a37/}
}