M. Nummestad

Hematological changes in normal men during prolonged severe exercise.

P. Opstad, R. Ekanger, R. Ljosland, 1978, American corrective therapy journal.

Performance, mood, and clinical symptoms in men exposed to prolonged, severe physical work and sleep deprivation.

P. Opstad, N. Raabe, P K Opstad, 1978, Aviation, space, and environmental medicine.