1. Errors in hypocenter location: picking, model, and magnitude dependence;Billings;Bull. seism. Soc. Am.,,1994
2. The amplitude-distance curve for short period teleseismic P-waves;Carpenter;Geophys. J. R. astr. Soc.,1967
3. An analysis of P waves to North American stations, in the distance range 32° to 100°;Cleary;Bull. seism. Soc. Am.,,1966
4. Does more mean less in epicentre estimation?;Douglas;Phys. Earth Planet. Inter.,,2005