1.Microprocessor based PWM inverter using modified regular sampling technique. U.M.Rao, G.N.Acharya, S.S.Shekhawat, W.Shepherd, Y.M.Ng. IEEE ?AS 1986.

2.An auxiliary impulse commutated three phase variable frequency thyristor inverter using delayed firing technique. U.M.Rao, K.S.Sarma, Prem kumar. International Symposium on Instrumentation, 1978.

3.A new concept for PWM converter. U.M.Rao, Ramesh babu, Rahul Varma. National seminar on AC motor drives for transportation and industrial applications, 1987.

4.Power Electronics, an emerging technology for saving of energy. U.M.Rao. FICCI Conference on energy saving in industry, 1988.

5.Simulation of inverter fed induction motor with core losses. U.M.Rao, T.A.Lipo. IEEE Power electronics specialist conference 1989.