Antti Piippo Kalle Suomela Marko Hinkkanen Jorma Luomi Sensorless PMSM Drive with DC-link Current Measurement. 2371-2377 2007 IAS https://doi.org/10.1109/07IAS.2007.358 conf/iasam/2007 db/conf/iasam/iasam2007.html#PiippoSHL07