Renato L. G. CavalcanteYuxiang ShenSlawomir StanczakElementary Properties of Positive Concave Mappings With Applications to Network Planning and Optimization.1774-1783201664IEEE Trans. Signal Process.7https://doi.org/10.1109/TSP.2015.2502544db/journals/tsp/tsp64.html#CavalcanteSS16