found: Performance prediction of centrifugal pumps and compressors, c1979 (a.e.)t.p. (S. Gopalakrishnan; Byron Jackson Pump Division, Borg-Warner Corp.)
notfound: AMWS, 13th ed.;Ref. India, 1975/76;India WW, 1977/78.
found: Unconventional blade design for axial compressors, 1969:t.p. (Sankaraiyer Gopalakrishnan ; Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1969; B.Sc. Madras University, 1960; B.Tech. Indian Inst. of Tech. Madras, 1964; M.S. California Institute of Technology, 1966)