Papers by Lieve Helsen:

Title: Simulation Speed Analysis and Improvements of Modelica Models for Building Energy Simulation
Authors: Filip Jorissen, Michael Wetter and Lieve Helsen
Links: Abstract, Full paper

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Title: Methodology for Obtaining Linear State Space Building Energy Simulation Models
Authors: Damien Picard, Filip Jorissen and Lieve Helsen
Links: Abstract, Full paper