@article{1077475518, author = {Santal\'o, L. A.}, title = {Integral geometry on surfaces}, journal = {Duke Math. J.}, volume = {16}, number = {1}, year = {1949}, pages = { 361-375}, language = {en}, url = {http://dml.mathdoc.fr/item/1077475518} }
Santaló, L. A. Integral geometry on surfaces. Duke Math. J., Tome 16 (1949) no. 1, pp. 361-375. http://gdmltest.u-ga.fr/item/1077475518/