- Bordoni B, Varacallo M. Muscle Cramps. [Updated 2018 Oct 27]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2018 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK499895/
- Martin D. Hoffman, Trent Stellingwerff & Ricardo J.S. Costa (2018): Considerations for ultra-endurance activities: part 2 – hydration. Research in Sports Medicine. DOI: 10.1080/15438627.2018.1502189
- Martin D. Hoffman, Andy Pasternak, Ian Rogers, Morteza Khodaee, John Hill, David Townes, Bernd Volker Scheer, Brian Krabak, Patrick Basset, Grant Lipman (2014) Medical services at Ultra-Endurance Foot Races in Remote Environments: Medical Issues and Consensus Guidelines. Sports Medicine. DOI 10.1007/s40279-014-0189-3