Molecular Weight and Association of Asphaltenes: a Critical Review J. G. Speight, D. L. Wernick, K. A. Gould, R. E. Overfield and B. M. L. Rao Rev. Inst. Fr. Pét., 40 1 (1985) 51-61 Published online: 01 November 2006 DOI: 10.2516/ogst:1985004