@article{10_4153_CJM_1985_058_1,
     author = {Treiman, Jay S.},
     title = {Generalized {Gradients,} {Lipschitz} behavior and {Directional} {Derivatives}},
     journal = {Canadian journal of mathematics},
     pages = {1074--1084},
     year = {1985},
     volume = {37},
     number = {6},
     doi = {10.4153/CJM-1985-058-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1985-058-1/}
}