@article{AFM_1964_336-344_a24,
     author = {Rolf Nevanlinna and Olli Lehto and Ilppo Simo Louhivaara},
     title = {Preface},
     journal = {Annales Fennici Mathematici},
     year = {1964},
     volume = {336-344},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_1964_336-344_a24/}
}