@article{10_4064_ap_25_3_293_302,
     author = {Roman Ger},
     title = {Convex functions of higher orders in {Euclidean} spaces},
     journal = {Annales Polonici Mathematici},
     pages = {293--302},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {1971},
     doi = {10.4064/ap-25-3-293-302},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-25-3-293-302/}
}