@article{rischel_heterodyne_1967,
	title = {Heterodyne filter},
	volume = {1},
	issn = {0589-6681},
	shorttitle = {{ARIPUC}},
	journal = {Annual Reports of the Institute of Phonetics, University of Copenhagen},
	author = {Rischel, Jørgen},
	year = {1967},
	pages = {13--14},
}

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