Are Chondrules in the CB Carbonaceous Chondrite Gujba Primary (Nebular) or Secondary (Asteroidal)? Krot, A. N. ; Amelin, Y. ; Russell, S. S. ; Twelker, E. Abstract Publication: Meteoritics and Planetary Science Supplement Pub Date: August 2004 Bibcode: 2004M&PSA..39.5044K