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APA Citation
Unknown (2009). Fixed effects regression models. Thousand Oaks : SAGE Publications, Inc. http://access.bl.uk/ark:/81055/vdc_100025424875.0x000001
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Unknown (2009). Fixed effects regression models. Thousand Oaks : SAGE Publications, Inc. http://access.bl.uk/ark:/81055/vdc_100025424875.0x000001