nZEB retrofit of a concrete large panel apartment buildingKuusk, Kalle; Kalamees, TargoEnergy procedia2015 / p. 985-990 : ill Quantification of economic benefits of renovation of apartment buildings as a basis for cost optimal 2030 energy efficiency strategiesPikas, Ergo; Kurnitski, Jarek; Liias, Roode; Thalfeldt, MartinEnergy and buildings2015 / p. 151-160 : ill