Freedman, P. van Nieuwenhuizen and S. Ferrara, "Progress Toward A Theory Of Supergravity", "Physical Review" D13 (1976) pp 3214–3218.
Freedman, P. van Nieuwenhuizen, S. Ferrara, «Progress Toward A Theory Of Supergravity», "Physical Review" D13 (1976) pp 3214-3218.