@article{IM_1987__89_143476,
     author = {M. Aschbacher},
     title = {The 27-dimensional module for {E6.} {I.}},
     journal = {Inventiones mathematicae},
     pages = {159--196},
     publisher = {mathdoc},
     volume = {89},
     year = {1987},
     zbl = {0629.20018},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__89_143476/}
}