Have all the adjectives gone? 論文 Backhouse, Anthony E. ·1984 ·『Lingua』 62(3) pp. 169-186 doi:10.1016/0024-3841(84)90074-3
On the status of nai in modern Japanese 論文 Anthony E. Backhouse ·2009-01-01 ·『Journal of Japanese Linguistics』 25(1) pp. 59-74 doi:10.1515/jjl-2009-0105