Akmajian, Adrian and Steele, Susan and Wasow, Thomas. 1979. The Category AUX in Universal Grammar. Linguistic Inquiry 10. 1-64.
@article{Akmajian-et-al-1979, author = {Akmajian, Adrian and Steele, Susan and Wasow, Thomas}, journal = {Linguistic Inquiry}, pages = {1-64}, title = {The Category AUX in Universal Grammar}, volume = {10}, year = {1979}, iso_code = {lui}, olac_field = {typology; syntax; general_linguistics; morphology}, wals_code = {lui} }