@article{CM_1956-1958__13__247_0,
     author = {Kamalamma, K. N.},
     title = {The congruence of tangents to a system of curves on a surface},
     journal = {Compositio Mathematica},
     pages = {247--256},
     publisher = {Kraus Reprint},
     volume = {13},
     year = {1956-1958},
     mrnumber = {104237},
     zbl = {0099.37103},
     language = {en},
     url = {http://www.numdam.org/item/CM_1956-1958__13__247_0/}
}