- http://ltwiki.org
- http://ltspicegoodies.ltwiki.org
- https://groups.yahoo.com/neo/groups/LTspice/info?guccounter=1
- https://github.com/kanedahiroshi/LTspiceControlLibrary
- https://ocw.mit.edu/resources/res-6-010-electronic-feedback-systems-spring-2013/video-course-manual/
- http://www.cds.caltech.edu/~murray/books/AM08/pdf/am06-pid_16Sep06.pdf
- https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-334-power-electronics-spring-2007/lecture-notes/ch8.pdf
- https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-334-power-electronics-spring-2007/lecture-notes/ch6.pdf
- http://w5jgv.com/hv-ps1/pdf/design_of_magnetic_components.pdf
- https://www.smps.us/magnetics.html
- http://info.ee.surrey.ac.uk/Workshop/advice/coils/gap/index.html
- https://coefs.uncc.edu/mnoras/files/2013/03/Transformer-and-Inductor-Design-Handbook_Chapter_17.pdf