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Nordgren, Birgitta, Cecilia Fridén, Eva Jansson, Ted Österlund, Wilhelmus Johannes Grooten, Christina H. Opava, i Anette Rickenlund. Criterion Validation of Two Submaximal Aerobic Fitness Tests, the Self-monitoring Fox-walk Test and the Åstrand Cycle Test in People With Rheumatoid Arthritis. BioMed Central, 2014.

Nordgren, Birgitta, et al. Criterion Validation of Two Submaximal Aerobic Fitness Tests, the Self-monitoring Fox-walk Test and the Åstrand Cycle Test in People With Rheumatoid Arthritis. BioMed Central, 2014.