1. Jeffreys, Harold, , The Earth, 2 Cambridge, 1929,
2. Uller, Karl, , , Die Entdeckung des Wellen-Begrlffes, , Konrad Trilsch, , Wurzburg, , 1937, ; also series of Important papers in Ger. Beitr. Geophysik, 1927-36, and elsewhere.
3. Physics of the Earth VII: Internal constitution of the Earth, Beno, Gutenberg, , McGraw-Hill, New York., 1939,
4. On waves propagated along the plane surface of an elastic solid;Rayleigh;Proc London Math. Soc,1885
5. Love, A. E. H., , Some problems of geodynamics, Cambridge Univ. Press, 1911,