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2. Leonardo da Vinci, 1483–1518. Codex Atlanticus 225a. Compiled and edited from the original manuscripts by J.P. Richter, The literary works of Leonardo da Vinci Vol. 2. Phaidon Publishers, New York.
3. da Leonardo Vinci, 1488–1489. Manuscript B.N.2037.2b. Compiled and edited from the original manuscripts by J.P. Richter, The literary works of Leonardo da Vinci Vol. 2. Phaidon Publishers, New York.
4. Coordination of leg muscles during speed skating;de Koning;Journal of Biomechanics,1991
5. Ice friction during speed skating;de Koning;Journal of Biomechanics,1992