@article{201804.0271,
	doi = {10.20944/preprints201804.0271.v1},
	url = {https://doi.org/10.20944/preprints201804.0271.v1},
	year = 2018,
	month = {April},
	publisher = {Preprints},
	author = {Thomas F. Hansen},
	title = {Fitness in Evolutionary Biology},
	journal = {Preprints}
}