@article{JCA_1999_6_2_JCA_1999_6_2_a7,
     author = {D. Pallaschke and R. Urbanski},
     title = {Invariants of {Pairs} of {Compact} {Convex} {Sets}},
     journal = {Journal of convex analysis},
     pages = {367--376},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/JCA_1999_6_2_JCA_1999_6_2_a7/}
}