Observation of spin-1 f1(1285) in the reaction gamma gamma *--> eta 0 pi + pi - - Gidal G; Boyer J; Butler F; Cords D; Abrams GS; Amidei D; Baden AR; Barklow T; Boyarski AM; Burchat P; Burke DL; Dorfan JM; et al. (Physical review letters, 1987)