@article{AM2_1969__2_182303,
     author = {B. SCHWEIZER and A. SKLAR},
     title = {A {Grammar} of {Functions,} {I}},
     journal = {Aequationes mathematicae},
     pages = {62--85},
     year = {1969},
     volume = {2},
     url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182303/}
}