@article{701716,
     title = {The generalized $\mathcal {A}\_\infty $-algebra structure on BGG sequences and generalized associative operad},
     booktitle = {Proceedings of the 22nd Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {2003},
     pages = {[163]-183},
     mrnumber = {MR1982444},
     zbl = {1051.18006},
     url = {http://dml.mathdoc.fr/item/701716}
}

Somberg, Petr. The generalized $\mathcal {A}_\infty $-algebra structure on BGG sequences and generalized associative operad, dans Proceedings of the 22nd Winter School "Geometry and Physics", GDML_Books,  (2003), pp. [163]-183. http://gdmltest.u-ga.fr/item/701716/