%0 Journal Article %A Deveney, James K. %A Heerema, Nickolas %T Higher Derivations and Distinguished Subfields %J Canadian journal of mathematics %D 1988 %P 131-141 %V 40 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1988-006-6/ %R 10.4153/CJM-1988-006-6 %F 10_4153_CJM_1988_006_6