@article{10_4153_CJM_1981_065_4,
     author = {Heerema, N. and Morrison, T.},
     title = {On {Derivations} {Induced} by {p-Adic} {Fields}},
     journal = {Canadian journal of mathematics},
     pages = {840--856},
     year = {1981},
     volume = {33},
     number = {4},
     doi = {10.4153/CJM-1981-065-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-065-4/}
}