@book{51218,
	author = {Pairman, Eleanor.},
	title = {Tables of the digamma and trigamma functions,},
	publisher = {Cambridge university press; Chicago,},
	year = {1919.},
	series = {Tracts for computers, ed. by Karl Pearson ... no.I},
	address = {London,},
	note = {At head of title: Department of applied statistics (Computing section) University of London, University college.}
}