Comet C/2013 n4 (borisov) Borisov, G. ; Ionov, I. ; Bryzgalov, O. ; Novichonok, A. ; Bill, H. ; Kyrylenko, P. ; Ivashchenko, Y. ; Carbognani, A. ; Petrillo, G. ; Romas, E. ; Nevski, V. ; Zelyoniy, O. ; Porfir'ev, A. ; Sato, H. ; Birtwhistle, P. ; Williams, G. V. Abstract Publication: Minor Planet Electronic Circulars Pub Date: July 2013 Bibcode: 2013MPEC....N...51B