1. R. Olaru, C. Cotae, Transducers and Magnetofluidic Devices for Measurement and Control, BIT Publishing House, Iasi, 1997, p. 269 (in Romanian).
2. R. Olaru, Researches on the possibilities to realize magnetic fluid transducers, Doctoral Thesis, Technical University of Iasi, 1994, unpublished (in Romanian).
3. C. Cotae, R. Olaru, Romanian Patent RO 99038, 1990.
4. Magnetic Birefringence and Dichroism in Magnetic Fluid
5. C. Cotae, On the behavior of magnetic colloids in magnetic field, Doctoral Thesis, CSEN-CFT, Iasi, 1982, unpublished (in Romanian).