1. The elasto-hydrodynamic lubrication of rollers
2. Birkhoff G. & DeBoor C. R. 1965 Approximation of functions. New York: Elsevier.
3. J;Birkhoff G. R.;Math. Mech.,1964
4. Cheng H. S. & Sternlicht B. 1965 Proc. In t. Lub. Conf. (ASME New York).
5. Proc;Christopherson D. G.;Inst. Mech. Engrs,1941