@article{MZ_1964__85_170306,
     author = {William D.L. Aplling},
     title = {A convergence theorem concerning real-valued interval functions.},
     journal = {Mathematische Zeitschrift},
     pages = {314--318},
     year = {1964},
     volume = {85},
     zbl = {0136.34502},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__85_170306/}
}