@article{AFM_1987_12_2_a7,
     author = {Julian Gevirtz},
     title = {On the difference quotients of an analytic function},
     journal = {Annales Fennici Mathematici},
     pages = {237--259},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1987},
     doi = {10.5186/aasfm.1987.1210},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1987.1210/}
}