These references have come in handy at one point or another: Papers Dixon, Mark J., and Coles, Stuart G. “Modelling association football scores and inefficiencies in the football betting market.” Journal of the Royal Statistical Society: Series C (Applied Statistics) 46, no. 2 (1997) 265-280. DOI Karlis, Dimitris, and Ioannis Ntzoufras. “Analysis of sports data by using bivariate Poisson models.” Journal of the Royal Statistical Society: Series D (The Statistician) 52, 3 (2003) 381-393.