Aerospace Power Systems MATLAB/Simulink Toolbox (APST) was developed by Matthew Williams and Justin Koeln at the University of Illinois at Urbana-Champaign. The toolset is free to use for academic purposes. Any work that uses the APS Toolbox should cite
Williams, M. A., "A Framework for the Control of Electro-Thermal Aircraft Power Systems," PhD Dissertation, University of Illinois at Urbana-Champaign, 2017.