@article{701406,
     title = {Generalized inverses of elliptic systems of differential operators with constant coeffcients and related Reduce programs for explicit calculations},
     booktitle = {Proceedings of the Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1987},
     pages = {[21]-28},
     mrnumber = {MR0946709},
     zbl = {0651.35027},
     url = {http://dml.mathdoc.fr/item/701406}
}

Brackx, F.; Delanghe, R.; van Hamme, J. Generalized inverses of elliptic systems of differential operators with constant coeffcients and related Reduce programs for explicit calculations, dans Proceedings of the Winter School "Geometry and Physics", GDML_Books,  (1987), pp. [21]-28. http://gdmltest.u-ga.fr/item/701406/