Citation: Rj. Wainscoat et J. Kormendy, A NEW COLOR IMAGE OF THE CRAB-NEBULA, Publications of the Astronomical Society of the Pacific, 109(733), 1997, pp. 279-288
Citation: Rb. Tully et al., THE URSA-MAJOR CLUSTER OF GALAXIES .1. CLUSTER DEFINITION AND PHOTOMETRIC DATA, The Astronomical journal, 112(6), 1996, pp. 2471