no. 1
On G 2 -manifolds
Annales mathématiques Blaise Pascal, Tome 1 (1994) no. 1, pp. 27-42. 
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     author = {Kobotis, A. and Xenos, Ph.J.},
     title = {On $G_2$-manifolds},
     journal = {Annales math\'ematiques Blaise Pascal},
     pages = {27--42},
     publisher = {Laboratoires de Math\'ematiques Pures et Appliqu\'ees de l'Universit\'e Blaise Pascal},
     volume = {1},
     number = {1},
     year = {1994},
     mrnumber = {1275215},
     zbl = {0804.53047},
     language = {en},
     url = {http://archive.numdam.org/item/AMBP_1994__1_1_27_0/}
}
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Kobotis, A.; Xenos, Ph.J. On $G_2$-manifolds. Annales mathématiques Blaise Pascal, Tome 1 (1994) no. 1, pp. 27-42. http://archive.numdam.org/item/AMBP_1994__1_1_27_0/

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