@article{NUMA_1969__13_131913,
     author = {E. BOHL},
     title = {\"Uber {Fehlerabsch\"atzungen} bei nichtlinearen {Operatorgleichungen.}},
     journal = {Numerische Mathematik},
     pages = {226--237},
     year = {1969},
     volume = {13},
     zbl = {0195.16601},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1969__13_131913/}
}