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"Massless fields in curved space-time: The conformal formalism" (1986) Castagnino, M.A.; Sztrajman, J.B. Journal of Mathematical Physics. 27(4):1037-1047
10.1063/1.527145
paper_00222488_v27_n4_p1037_Castagnino
paper_00222488_v27_n4_p1037_Castagnino
