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Sommervoll Y, Ettema G, Vereijken B.Sommervoll Y, et al. Among authors: ettema g.Percept Mot Skills. 2011 Oct;113(2):647-61. doi: 10.2466/10.25.PMS.113.5.647-661.Percept Mot Skills. 2011.PMID: 22185079
van den Tillaar R, Ettema G.van den Tillaar R, et al. Among authors: ettema g.J Hum Kinet. 2013 Oct 8;38:63-71. doi: 10.2478/hukin-2013-0046. eCollection 2013.J Hum Kinet. 2013.PMID: 24235985Free PMC article.