1. The variation of density and ellipticities of strata of equal density within the Earth;Bullen;Mon. Not. R. Astr. Soc., Geophys. Supp.,1936
2. The problem of Earth's density variation;Bullen;Bull. Seis. Soc. Amer.,1940
3. The density variation of the Earth's central core;Bullen;Bull. Seis. Soc. Amer.,1942
4. Attempted evaluation of the rigidity of the Earth from the tides of long period;Darwin;Sci. Papers, Cambridge,1907
5. On seismic waves;Gutenberg;Beitr. Geophysik,1935