K. Okesina, V. Iyawe, A. Okesina, and L. Ojulari, “Changes in Peak Expiratory Flow Rate, Blood Pressure and Pulse Rate Following Ingestion of Increased Coffee Concentrations in Healthy Male Adults”, J. Med. Biomed. Res., vol. 11, no. 1, pp. 78–87, Sep. 2012.