1. Calcium soaps in flotation deinking; fundamental studies using surface force and coagulation techniques
2. Surface chemistry of flotation deinking: Agglomeration kinetics and agglomerate structure.
3. (a) R. Rao, P. Stenius, The effect of flotation deinking chemicals on bubble formation in: Proceedings of the Fourth Research Forum on Recycling, Chateau Frontenac, October 7–9 1997, Quebec, Canada, p. 11;
4. (b) R. Rao, P. Stenius, Mechanisms of ink release from model surfaces and fibre in: Proceedings of the Fourth Research Forum on Recycling, Chateau Frontenac, October 7–9 1997, Quebec, Canada, p. 105.