@article {IOPORT.50273034,
    author       = {Russo, Anah{\'\i} Dello and Alonso, Ana E.},
    title        = {A posteriori error estimates for nonconforming approximations of Steklov eigenvalue problems},
    year         = {2011},
    journal      = {Computers & Mathematics with Applications},
    volume       = {62},
    number       = {11},
    pages        = {4100-4117},
    doi          = {10.1016/j.camwa.2011.09.061},
    identifier   = {50273034},
}