Photometry of the Oort Cloud comet C/2009 P1 (Garradd): Pre-perihelion observations at 5.7 and 2.5 AU. - Mazzotta Epifani, E.; Snodgrass, C.; Perna, D.; Dall’Ora, M.; Palumbo, P.; Della Corte, V.; Alvarez-Candal, A.; Melita, M.; Rotundi, A. (Planetary & Space Science, 2016)