Scarf, Philip (20 Mar 2007). "Route choice in mountain navigation, Naismith's rule, and the equivalence of distance and climb". Journal of Sports Sciences. 25 (6): 719–726. doi:10.1080/02640410600874906. PMID17454539. S2CID13897101. Also available in: ResearchGate
"Naismith's rule". Maumturks Walking Club. Retrieved 22 January 2017.
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Scarf, Philip (20 Mar 2007). "Route choice in mountain navigation, Naismith's rule, and the equivalence of distance and climb". Journal of Sports Sciences. 25 (6): 719–726. doi:10.1080/02640410600874906. PMID17454539. S2CID13897101. Also available in: ResearchGate
Scarf, Philip (20 Mar 2007). "Route choice in mountain navigation, Naismith's rule, and the equivalence of distance and climb". Journal of Sports Sciences. 25 (6): 719–726. doi:10.1080/02640410600874906. PMID17454539. S2CID13897101. Also available in: ResearchGate
Scarf, Philip (20 Mar 2007). "Route choice in mountain navigation, Naismith's rule, and the equivalence of distance and climb". Journal of Sports Sciences. 25 (6): 719–726. doi:10.1080/02640410600874906. PMID17454539. S2CID13897101. Also available in: ResearchGate