Awan, S. A., N. Cooper, U. Muaz, and S. Khan. “Recurrent Nocturnal Chest Pain in an Elderly Patient: A Case Report of Variant Angina”. Indus Journal of Bioscience Research, vol. 3, no. 6, June 2025, pp. 354-7, doi:10.70749/ijbr.v3i6.1649.