Grattan-Guinness, Ivor (1993), "The Sylvester Medal: origins, and recipients 1901–1949", Notes and Records of the Royal Society of London, 47 (1): 105–108, doi:10.1098/rsnr.1993.0009, MR1214538, S2CID144823754
Grattan-Guinness, Ivor (1993), "The Sylvester Medal: origins, and recipients 1901–1949", Notes and Records of the Royal Society of London, 47 (1): 105–108, doi:10.1098/rsnr.1993.0009, MR1214538, S2CID144823754
Grattan-Guinness, Ivor (1993), "The Sylvester Medal: origins, and recipients 1901–1949", Notes and Records of the Royal Society of London, 47 (1): 105–108, doi:10.1098/rsnr.1993.0009, MR1214538, S2CID144823754