Comparison of COP estimation methods for large-scale heat pumps used in energy planningPieper, Henrik; Ommen, Torben; Kjær Jensen, JonasEnergy2020 / art. 117994, 13 p. : ill https://doi.org/10.1016/j.energy.2020.117994 Modelling framework for integration of large-scale heat pumps in district heating using low-temperature heat sources : A case study of Tallinn, EstoniaPieper, Henrik; Mašatin, Vladislav; Volkova, Anna; Ommen, Torben; Elmegaard, Brian; Markussen, Wiebke BrixInternational journal of sustainable energy planning and management2019 / p. 67–86 : ill https://doi.org/10.5278/ijsepm.2019.20.6 Journal metrics at Scopus Article at Scopus Valorisation of waste heat in existing and future district heating systemsPakere, Ieva; Blumberga, Dagnija; Volkova, Anna; Lepiksaar, Kertu; Zirne, AgateEnergies2023 / art. 6796 https://doi.org/10.3390/en16196796