More on double modals. Pampell, J. R. In volume 2, pages 110–121, 1975.
bibtex   
@inproceedings{pampell_more_1975,
	title = {More on double modals},
	volume = {2},
	author = {Pampell, John R.},
	year = {1975},
	keywords = {Multiple modals},
	pages = {110--121},
}
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