@article{Özkurt:88326,
      author        = "Özkurt, B. and Aytekin, M.E. and Madre, M.A. and Sotelo,
                       A. and Torres, M.A.",
      title         = "{Improving thermoelectric properties of Ca 3 Co 4 O 9+d
                       through both Na doping and K addition at optimal values}",
      year          = "2019",
}