5Automobile Insurers Bureau of Massachusetts, Massachusetts private passenger automobile insurance manual. 2007.
6Taylor, G.. Setting a Bonus-Malus scale in the presence of other rating factors[J]. ASTIN Bulletin, 1997, 31, 317 -335.
7Pitrebois, S., Denuit, M. and Walhin, J.F.. Setting a Bonus-Malus scale in the presence of other rating factors: Taylor's work revisited[J]. ASTIN Bulletin, 2003, 33, 419 - 436.