Erik Höckerdal, Stefan Orrling, Elina Fantenberg,  Cylinder Charge Estimation in Diesel Engines with Dual Independent Variable Valve Timing, IFAC Papers online, Dominique Nelson-Gruel (ed.), IFAC Papers online, pp. 636-641 (2019)  https://doi.org/10.1016/j.ifacol.2019.09.101

Andreas Thomasson, Sepideh Nikkar, Erik Höckerdal,  Cylinder Pressure Based Cylinder Charge Estimation in Diesel Engines with Dual Independent Variable Valve Timing, SAE Technical Paper, SAE Technical Papers, Society of Automotive Engineers (2018)  https://doi.org/10.4271/2018-01-0862

Erik Höckerdal, Lars Eriksson, Erik Frisk,  Off- and On-Line Identification of Maps Applied to the Gas Path in Diesel Engines, Lecture notes in control and information sciences 418:241-256 (2012)  https://doi.org/10.1007/978-1-4471-2221-0_14

Erik Höckerdal,  Model Error Compensation in ODE and DAE Estimators, Linköping Studies in Science and Technology. Dissertations 1366, Linköping University Electronic Press, Linköping (2011)

Erik Höckerdal, Erik Frisk, Lars Eriksson,  Bias Reduction in DAE Estimators by Model Augmentation: Observability Analysis and Experimental Evaluation, 50th IEEE Conference on Decision and Control and European Control Conference (CDC-ECC), 2011, Decision and Control (CDC), pp. 7446-7451, Institute of Electrical and Electronics Engineers (IEEE) (2011)  https://doi.org/10.1109/CDC.2011.6160697