@article {sankoff76frequency,
	title = {Frequency of Insertion, Deletion, Transversion and Transition in the Evolution of 5s Ribosomal {RNA}},
	journal = {Journal of Molecular Evolution},
	volume = {7},
	year = {1976},
	pages = {133-145},
	author = {Sankoff, D. and Cedergren, R.J. and Guy Lapalme}
}
