Spectrophotometry and multicolour imagery of the planetary nebula around the p cygni star ag carinae - Rossi, C.; Altamore, A; Costa, Roberto Dell'Aglio Dias da; Damineli Neto, Augusto; Freitas Pacheco, José Antonio; Cassatella, A; Marenzi, A R; Persi, P; Polcaro, V F; Viotti, R (International Astronomical Union Symposium, 1993)