1. [1] Japanese Ministry of Health, Labour and Welfare, “Overview of the population statistics in 2017 [in Japanese].” https://www.mhlw.go.jp/toukei/saikin/hw/jinkou/kakutei17/xls/29toukei.xls, 2017.
2. [2] S. Poplack, Code switching: Linguistic, pp.2062-2065, Elsevier, 2001.
3. [3] M. Nakamura, “Developing codeswitching patterns of a Japanese/English bilingual child,” Proc. ISB4, Somerville, MA, USA, pp.1679-1689, 2005.
4. [4] S.S. Fotos, “Japanese-English code switching in bilingual children,” JALT Journal, vol.12, no.1, pp.75-98, 1990.
5. [5] A. Tjandra, S. Sakti, and S. Nakamura, “Listening while speaking: Speech chain by deep learning,” Proc. ASRU, Okinawa, Japan, pp.301-308, IEEE, 2017. 10.1109/asru.2017.8268950