TY - JOUR AU - Zhidkov, Peter E. TI - Sufficient conditions for functions to form Riesz bases in \(L_2\) and applications to nonlinear boundary-value problems JO - Electronic journal of differential equations PY - 2001 VL - 2001 UR - http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a37/ LA - en ID - EJDE_2001__2001__a37 ER -