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| EDITION LIAUNIGG (2010), Austria | EDITION LIAUNIGG (2009), Austria | ||
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| "Задачник", РОСМЭН (1999), Russia | "Mieleton matikka", WSOY (2002), Finland |
Ediciones Oniro (2008), Spain | Ediciones Oniro (2009), Spain |
Funny Math Problem Book, 1999
Rights sold to: Austria (German rights) - EDITION LIAUNIGG, Spain - ONIRO, Finland - WSOY