?url_ver=Z39.88-2004&rft_id=doi%3A10.2478%2Fhukin-2018-0082&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Sanchez-Sanchez&rft.aufirst=Javier&rft.au=Sanchez-Sanchez%2C+Javier&rft.atitle=Physical+Performance+During+Soccer-7+Competition+and+Small-Sided+Games+in+U12+Players&rft.date=2019&rft.issue=1&rft.pages=281-290&rft.volume=67&rft.title=Journal+of+Human+Kinetics&rft.issn=1899-7562&rft.genre=article