@article{10_4064_ap_39_1_37_48,
     author = {Ali Azzam and Erwin Kreyszig},
     title = {On {Bergman} operators of exponential type},
     journal = {Annales Polonici Mathematici},
     pages = {37--48},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {1981},
     doi = {10.4064/ap-39-1-37-48},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-39-1-37-48/}
}