@article{MET_1970__15_175429,
     author = {N. Singh},
     title = {Spherical {Probable} {Error} {(Spe)} and its {Estimation}},
     journal = {Metrika},
     pages = {149--163},
     publisher = {mathdoc},
     volume = {15},
     year = {1970},
     zbl = {0209.50101},
     url = {http://geodesic.mathdoc.fr/item/MET_1970__15_175429/}
}