@article{JCA_2017_24_2_JCA_2017_24_2_a16,
     author = {V. Soltan},
     title = {Convex {Surfaces} with {Planar} {Polar} {Sets} and {Point-Source} {Shadow-Boundaries}},
     journal = {Journal of convex analysis},
     pages = {645--66},
     year = {2017},
     volume = {24},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JCA_2017_24_2_JCA_2017_24_2_a16/}
}