@article{10_4153_CJM_2005_039_x,
     author = {Karigiannis, Spiro},
     title = {Deformations of {G} 2 and {Spin(7)} {Structures}},
     journal = {Canadian journal of mathematics},
     pages = {1012--1055},
     year = {2005},
     volume = {57},
     number = {5},
     doi = {10.4153/CJM-2005-039-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2005-039-x/}
}