Helicoidal single-layer cylindrical coil self-inductance evaluation: a didactic method. - Roberto Petry Homrich; Ernesto Ruppert; Daltro Garcia Pinatti (IEEE Trans. Educ., 2001)

Comparison between radial and axial permanent magnet generators for low speed application. - Velington de Aquino Neumann; Roberto Petry Homrich (I2MTC, 2014)