Paper  bibtex   

@misc{danecek_multiallelic_2014,
	title = {Multiallelic calling model in bcftools (-m)},
	url = {http://samtools.github.io/bcftools/call-m.pdf},
	publisher = {Published online},
	author = {Danecek, P and Schiffels, S and Durbin, R},
	year = {2014},
}