@article{ConradEvolvability,
	author = {Michael Conrad},
	journal = {Biosystems},
	number = {1},
	pages = {61--81},
	priority = {2},
	title = {The geometry of evolution},
	url = {http://dx.doi.org/10.1016/0303-2647(90)90030-5},
	volume = {24},
	year = {1990}
}