July, J., Y. Yunus, V. Sungono, S. As’ad, B. Suhadi, and A. A. Islam. “Cortisol Dynamics and Endothelin-1/Nitric Oxide Ratio Are Associated With Clinical Vasospasme”. Medical Journal of Indonesia, Vol. 22, no. 3, Aug. 2013, pp. 161-6, doi:10.13181/mji.v22i3.585.