Paulavičius, Remigijus, and Julius Žilinskas. “Global Optimization Using the Branch‐and‐bound Algorithm With a Combination of Lipschitz Bounds over Simplices”. Technological and Economic Development of Economy 15, no. 2 (June 30, 2009): 310-325. Accessed September 15, 2019. https://journals.vgtu.lt/index.php/TEDE/article/view/6447.