@article{MS2_1980__46_166689,
     author = {R.M. Dudley},
     title = {Acknowledgement of priority: {Second} derivates of convex functions.},
     journal = {Mathematica Scandinavica},
     pages = {61--61},
     publisher = {mathdoc},
     volume = {46},
     year = {1980},
     zbl = {0436.46033},
     url = {http://geodesic.mathdoc.fr/item/MS2_1980__46_166689/}
}