@article{JCA_2019_26_1_JCA_2019_26_1_a18,
     author = {D. Sain and K. Paul and A. Mal},
     title = {On {Approximate} {Birkhoff-James} {Orthogonality} and {Normal} {Cones} in a {Normed} {Space}},
     journal = {Journal of convex analysis},
     pages = {341--351},
     year = {2019},
     volume = {26},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JCA_2019_26_1_JCA_2019_26_1_a18/}
}