%0 Journal Article %A Jónsson, B. %A McNulty, G. %A Quackenbush, R. %T The Ascending and Descending Varietal Chains of a Variety %J Canadian journal of mathematics %D 1975 %P 25-31 %V 27 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-004-2/ %R 10.4153/CJM-1975-004-2 %F 10_4153_CJM_1975_004_2