@article{MAN_1972__197_162280,
     author = {A.K. Roy},
     title = {Facial {Structure} of the {Sum} of {Two} {Compact} {Convex} {Sets.}},
     journal = {Mathematische Annalen},
     pages = {189--196},
     publisher = {mathdoc},
     volume = {197},
     year = {1972},
     zbl = {0226.46056},
     url = {http://geodesic.mathdoc.fr/item/MAN_1972__197_162280/}
}