Olthof, S. B., Frencken, W. G., & Lemmink, K. A. (2019). A match-derived relative pitch area facilitates the tactical representativeness of small-sided games for the official soccer match. Journal of strength and conditioning research, 33(2), S. 523-530. doi:10.1519/JSC.0000000000002978

Olthof, Sigrid B.H., Wouter G.P Frencken, and Koen A.P.M Lemmink. "A Match-derived Relative Pitch Area Facilitates the Tactical Representativeness of Small-sided Games for the Official Soccer Match." Journal of Strength and Conditioning Research 33, no. 2 (2019): S. 523-530.

Olthof, Sigrid B.H., Wouter G.P Frencken, and Koen A.P.M Lemmink. "A Match-derived Relative Pitch Area Facilitates the Tactical Representativeness of Small-sided Games for the Official Soccer Match." Journal of Strength and Conditioning Research 33.2 (2019): S. 523-530.