@article{AFM_1972_501-520_a6,
     author = {Lauri Myrberg},
     title = {\"Uber die {Integration} der {Gleichung} {\ensuremath{\Delta}u} = c(z)u auf einer {Riemannschen} {Fl\"ache} im indefiniten {Fall}},
     journal = {Annales Fennici Mathematici},
     publisher = {mathdoc},
     volume = {501-520},
     year = {1972},
     doi = {10.5186/aasfm.1972.514},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1972.514/}
}