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http://www.stat.fi/tup/suoluk/suoluk_kansantalous_en.html
(retrieved September 18, 2012)
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http://www.stat.fi/tup/suoluk/suoluk_teollisuus_en.html
(retrieved September 18, 2012)
4. Harris, F.W.: How many parts to make at once. The Magazine of Management 10, 135–136 (1913)
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