සැකිල්ල:උපන්යාස doi/10.1038.2Fnature06896
Appearance
Valtonen, M. J.; Lehto, H. J.; Nilsson, K.; Heidt, J.; Takalo, L. O.; Sillanpää, A.; Villforth, C.; Kidger, M.; Poyner, G. (2008). "A massive binary black-hole system in OJ 287 and a test of general relativity" (PDF). Nature. 452 (7189): 851–853. doi:10.1038/nature06896. PMID 18421348.