By Tomiyama M.   Yamazaki N.   in European Journal of Combinatorics

ISSN:0195-6698|19|2|237-255

Elsevier‎(1998)‎

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By Tomiyama M   in Applied Linguistics

ISSN:0142-6001|21|3|304-332

Oxford University Press‎(2000)‎

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