Álvaro Ricieri Castro e SouzaJosé Roberto de A. AmazonasTaufik AbrãoEnergy-efficiency maximisation for cooperative and non-cooperative OFDMA cellular networks - a survey.216-248201627Trans. Emerg. Telecommun. Technol.2https://doi.org/10.1002/ett.2850db/journals/ett/ett27.html#SouzaAA16