@article{GDZPPN002451476,
title = {Spherical Probable Error (Spe) and its Estimation},
journal = {Metrika},
volume = {16},
year = {1970},
pages = {149-163},
zbl = {0209.50101},
url = {http://dml.mathdoc.fr/item/GDZPPN002451476}
}
Singh, N. Spherical Probable Error (Spe) and its Estimation. Metrika, Tome 16 (1970) pp. 149-163. http://gdmltest.u-ga.fr/item/GDZPPN002451476/