@article {SankoffEtAl1973,
	title = {Evolution of {5S} {RNA} and the non-randomness of base replacement},
	journal = {Nat. New Biol.},
	volume = {245},
	year = {1973},
	pages = {232{\textendash}234},
	author = {Sankoff, D. and Morel, C. and Cedergren, R. J.}
}
