@article{10_4153_CJM_1988_006_6,
     author = {Deveney, James K. and Heerema, Nickolas},
     title = {Higher {Derivations} and {Distinguished} {Subfields}},
     journal = {Canadian journal of mathematics},
     pages = {131--141},
     year = {1988},
     volume = {40},
     number = {1},
     doi = {10.4153/CJM-1988-006-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1988-006-6/}
}