%0 Journal Article %A Karigiannis, Spiro %T Deformations of G 2 and Spin(7) Structures %J Canadian journal of mathematics %D 2005 %P 1012-1055 %V 57 %N 5 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-2005-039-x/ %R 10.4153/CJM-2005-039-x %F 10_4153_CJM_2005_039_x