Y. Amau

Twinning rate by month of mother's birth in Japan.

M. Shimura, T. Miura, K. Nonaka, 1984, Acta geneticae medicae et gemellologiae.

Relationship Between Parents' Report Rate of Twin Language and Factors Related to Linguistic Development: Older Sibling, Nonverbal Play and Preschool Attendance

Yoko Kobayashi, K. Hayakawa, Kenji Kato, 2006, Twin Research and Human Genetics.

Relationship between parents' report rate of twin language and factors related to linguistic development: older sibling, nonverbal play and preschool attendance.

Yoko Kobayashi, K. Hayakawa, Kenji Kato, 2006, Twin research and human genetics : the official journal of the International Society for Twin Studies.