R. Ludwig and G. Bogdanov, RF Circuit Design, Theory and Practice, 2nd, Pearson, 2009, pp. 704, ISBN 978-0-13-147137-5.
S. Makarov, R. Ludwig, S. Bitar, Practical Electrical Engineering, Springer Verlag, pp. 990, 2016, ISBN 978-3-319-21172-5.
R. Bowankar and R. Ludwig, "An Optical Surface Inspection and Automatic Classification Technique Using the Rotated Wavelet Transform," IEEE Trans. Instrumentation and Measurements, Vol. 76, Issue 3, pp. 690 – 697, 2018.
A. Alqudsi, I. Costanzo, A. Mavretic and R. Ludwig, "Developing a High-Power Multilayer Ceramic Capacitor Qualification Test Setup for RF Subsystems," in IEEE Transactions on Instrumentation and Measurement, vol. 68, no. 9, pp. 3396-3404, Sept. 2019.
R. Bowankar and R. Ludwig, “An FPGA-based Feature Extraction Using Reconfigurable Rotated Wavelet Transform for various Classification Schemes, “IEEE 60th International Midwest Symposium on Circuits and Systems (MWSCAS), pp. 969-972, 2017.
R. Borwankar, M. Haider, R. Ludwig, Y. Massoud, “An Ultra-Low-Power, High Gain Mixer for Smart Cities Applications,” IEEE 60th International Midwest Symposium on Circuits and Systems (MWSCAS), pp. 822 -824, 2017.