@inbook {Stevens1981,
	title = {The search for invariant acoustic correlates of phonetic features},
	booktitle = {Perspectives on the study of speech},
	year = {1981},
	publisher = {Erlbaum},
	organization = {Erlbaum},
	address = {Hillsdale, {NJ}},
	keywords = {acoustic analysis, phonetics, phonology, акустичен анализ, фонетика, фонология},
	author = {Stevens, Kenneth N. and Blumstein, Sheila E.},
	editor = {Eimas, Peter D. and Miller, Joanne L.}
}
