Recasens & Espinosa (2005):2引Recasens, Fontdevila & Pallarès (1995) Recasens, Daniel; Espinosa, Aina, Articulatory, positional and coarticulatory characteristics for clear /l/ and dark /l/: evidence from two Catalan dialects, Journal of the International Phonetic Association, 2005, 35 (1): 1–25, doi:10.1017/S0025100305001878 Recasens, Daniel; Fontdevila, J; Pallarès, Maria Dolores, Velarization degree and coarticulatory resistance for /l/ in Catalan and German, Journal of Phonetics, 1995, 23 (1–2): 37–52, doi:10.1016/S0095-4470(95)80031-X
Recasens & Espinosa (2005) Recasens, Daniel; Espinosa, Aina, Articulatory, positional and coarticulatory characteristics for clear /l/ and dark /l/: evidence from two Catalan dialects, Journal of the International Phonetic Association, 2005, 35 (1): 1–25, doi:10.1017/S0025100305001878
McCarus, Ernest N., —A Kurdish Grammar(PDF), 1958 [11 June 2018], (原始内容存档(PDF)于2022-03-03)
icphs2019.org
Roon, Kevin D.; Whalen, D. H., Velarization of Russian labial consonants(PDF), International Congress of Phonetic Sciences ICPhS 2019, 2019 [2021-06-24], (原始内容存档(PDF)于2021-07-09)
Roon, Kevin D.; Whalen, D. H., Velarization of Russian labial consonants(PDF), International Congress of Phonetic Sciences ICPhS 2019, 2019 [2021-06-24], (原始内容存档(PDF)于2021-07-09)
McCarus, Ernest N., —A Kurdish Grammar(PDF), 1958 [11 June 2018], (原始内容存档(PDF)于2022-03-03)