Peng, Gongguan (2011). A phonetic study of Fuzhou Chinese(PDF) (Thesis). City University of Hong Kong. Note that the thesis does not mention the open rimes for /e/, /ø/ and /eu/ and does not analyse phonemes independently from tonal allophones.
doi.org
Mei, Tsu-lin (1970), "Tones and prosody in Middle Chinese and the origin of the rising tone", Harvard Journal of Asiatic Studies, 30: 86–110, doi:10.2307/2718766, JSTOR2718766
Mei, Tsu-lin (1970), "Tones and prosody in Middle Chinese and the origin of the rising tone", Harvard Journal of Asiatic Studies, 30: 86–110, doi:10.2307/2718766, JSTOR2718766