T A Howlett, S Tomlin, L Ngahfoong, L H Rees, B A Bullen, G S Skrinar et al
Howlett T A, Tomlin S, Ngahfoong L, Rees L H, Bullen B A, Skrinar G S et al.
Release of beta endorphin and met-enkephalin during exercise in normal women: response to training.
Br Med J (Clin Res Ed) 1984; 288 :1950
doi:10.1136/bmj.288.6435.1950