?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=%D0%A4%D1%83%D1%80%D0%BC%D0%B0%D0%BD%2C+%D0%AE%D1%80%D1%96%D0%B9&rft.aulast=%D0%A4%D1%83%D1%80%D0%BC%D0%B0%D0%BD&rft.aufirst=%D0%AE%D1%80%D1%96%D0%B9&rft.date=2018&rft.atitle=Effect+of+swimming+with+the+use+of+aqua+fitness+elements+and+interval+hypoxic+training+on+the+physical+fitness+of+boys+aged+11-12+years&rft.title=Pedagogy+of+Physical+Culture+and+Sports&rft.genre=article