@article{PIM_1964_N_S_04_18_a8,
     author = {D. K. Datta and M. K. Singal},
     title = {Generalization {Of} {Bonnet's} {Formula} {For} {A} {Subspace} {Of} {A} {Generalized} {Riemann} {Space}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {81 },
     publisher = {mathdoc},
     volume = {_N_S_04},
     number = {18},
     year = {1964},
     url = {http://geodesic.mathdoc.fr/item/PIM_1964_N_S_04_18_a8/}
}