1993, The effect of balneotherapy on the plasma-ß-endorphine (BE) level in patients with osteoarthritis

Merih Yurtkuran, et.al

Physikalische Medizin Rehabilitationsmedizin Kurortmedizin 03(05):130-132, October 1993

https://www.researchgate.net/publication/240503305_The_effect_of_balneotherapy_on_the_plasma-ss-endorphine_BE_level_in_patients_with_osteoarthritis