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Lua i Stíl Chicago (17ú heag.)Olejnik, Atephen. Data Analysis Strategies for Quasi-experimental Studies Where Differential Group and Individual Growth Rates Are Assumed. [S.l: s.n, 1978.
Lua MLA (9ú heag.)Olejnik, Atephen. Data Analysis Strategies for Quasi-experimental Studies Where Differential Group and Individual Growth Rates Are Assumed. s.n, 1978.
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