@article{RSMUP_1993__90__207_0,
     author = {Orsina, Luigi},
     title = {Solvability of linear and semilinear eigenvalue problems with $L^1$ data},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {207--238},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {90},
     year = {1993},
     mrnumber = {1257140},
     zbl = {0822.35106},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1993__90__207_0/}
}