@article{MAN_1976__223_162888,
     author = {Alfred Gray},
     title = {TheStructure of {Nearly} {K\"ahler} {Manifolds.}},
     journal = {Mathematische Annalen},
     pages = {233--248},
     publisher = {mathdoc},
     volume = {223},
     year = {1976},
     zbl = {0345.53019},
     url = {http://geodesic.mathdoc.fr/item/MAN_1976__223_162888/}
}