@article{700770,
     title = {On a closed range theorem for nonlinear operators},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1972},
     pages = {417-418},
     zbl = {0306.47027},
     url = {http://dml.mathdoc.fr/item/700770}
}

Swaminathan, S. On a closed range theorem for nonlinear operators, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1972), pp. 417-418. http://gdmltest.u-ga.fr/item/700770/