Atomic emission lines in the spectrum observed after the impact between the l-fragment of comet D/Shoemaker-Levy 9 and Jupiter - Costa, Roberto Dell'Aglio Dias da; Almeida, Amaury Augusto de; Codina-Landaberry, S J; Freitas Pacheco, José Antonio; Singh, Patan Deen (Astrophysical Journal, 1997)