Ritmeester, J. W., Kemper, H. C., Verschuur, R., Binkhorst, R. A., & Saris, W. H. (1985). Is a levelling-off criterion in oxygen uptake a prerequisite for a maximal performance in teenagers ? Children and exercise XI, S. 161-169.

Ritmeester, Jan Willem, Han C.G Kemper, Robbert Verschuur, Rob A. Binkhorst, and Wim H.M Saris. "Is a Levelling-off Criterion in Oxygen Uptake a Prerequisite for a Maximal Performance in Teenagers ?" Children and Exercise XI 1985: S. 161-169.

Ritmeester, Jan Willem, et al. "Is a Levelling-off Criterion in Oxygen Uptake a Prerequisite for a Maximal Performance in Teenagers ?" Children and Exercise XI 1985: S. 161-169.