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Bhatnagar, KS (1969) Secondary flow induced by the rotation of two concentric spheres about their common diameter in micropolar fluids. In: Rheologica Acta, 8 (1). pp. 44-54.
Bhatnagar, KS and Rajagopalan, Renuka (1968) Secondary flows induced by the rotation of a sphere or coaxial cones in micropolar fluids. In: Rheologica Acta, 7 (3). pp. 209-217.