@article{JCA_2015_22_3_JCA_2015_22_3_a4,
     author = {P.-K. Lin and W. Zhang and B. Zheng},
     title = {Ball {Proximinal} and {Strongly} {Ball} {Proximinal} {Spaces}},
     journal = {Journal of convex analysis},
     pages = {673--685},
     year = {2015},
     volume = {22},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/JCA_2015_22_3_JCA_2015_22_3_a4/}
}