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4.1 Main issues

- Relation between the two languages in the initial period:
-- Three options have been discussed:
--- 1. Single/mixed lexical and syntactic systems (Leopold 1939-1949; Volterra and Taeschner 1978; Taeschner 1983)
--- 2. Separate systems without interaction (Ronjat 1913; Bergman 1976; Meisel 1986, 1989; Genesee 1989; De Houwer 1990; Deuchar and Quay 2000)
--- 3. Separate systems with limited interaction (Gawlitzek-Maiwald and Tracy 1996; Döpke 1997, 1998; Hulk and Müller 2000; Yip and Matthews 2007)