A comparative analysis of NZEB energy performance requirements for residential buildings in Denmark, Estonia and FinlandSimson, Raimo; Thomsen, Kirsten Engelund; Wittchen, Kim Bjarne; Kurnitski, JarekE3S Web Conference: Cold Climate HVAC and Energy 20212021 / art. 14001, 12 p. : ill https://doi.org/10.1051/e3sconf/202124614001 Conference Proceedings at Scopus Article at Scopus Article at WOS