@article{ELMA_1996__51_3_141592,
     author = {Helmut L\"anger},
     title = {An elementary proof of the convergence of iterated exponentials.},
     journal = {Elemente der Mathematik},
     pages = {75--77},
     year = {1996},
     volume = {51},
     number = {3},
     zbl = {0865.26005},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1996__51_3_141592/}
}