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Westerterp, K.R., G.A.L Meijer, A.D.M Kester, L. Wouters, and F. ten Hoor. "Fat-free Mass As a Function of Fat Mass and Habitual Activity Level." International Journal of Sports Medicine 13, no. 2 (1992): S. 163-166.

Westerterp, K.R., et al. "Fat-free Mass As a Function of Fat Mass and Habitual Activity Level." International Journal of Sports Medicine 13.2 (1992): S. 163-166.