Radio Galaxy Zoo: Unsupervised Clustering of Convolutionally Auto-encoded Radio-astronomical Images. - Nicholas O. Ralph; Ray P. Norris; Gu Fang; Laurence A. F. Park; Timothy J. Galvin; Matthew J. Alger; Heinz Andernach; Chris J. Lintott; Lawrence Rudnick; Stanislav Shabala; O. Ivy Wong (CoRR, 2019)