@article {gustafson2003extension,
	title = {An extension of the Dirichlet prior for the analysis of longitudinal multinomial data},
	journal = {Journal of Applied Statistics},
	volume = {30},
	number = {3},
	year = {2003},
	pages = {293{\textendash}310},
	publisher = {Taylor \& Francis},
	doi = {10.1080/0266476022000030075},
	author = {Gustafson, P. and Walker, L.}
}
