Office, E. 2001. Serum melatonin concentrations in coronary heart disease patients with hypercholesterolaemia. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt;. 20, 1 (Sep. 2001), 22-23. DOI:https://doi.org/10.4102/satnt.v20i1.246.