@article{JCA_2011_18_3_JCA_2011_18_3_a4,
     author = {B. Xu and K. Nikodem and W. Zhang},
     title = {On a {Multivalued} {Iterative} {Equation} of {Order} n},
     journal = {Journal of convex analysis},
     pages = {673--686},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/JCA_2011_18_3_JCA_2011_18_3_a4/}
}