@article{JCA_2022_29_2_JCA_2022_29_2_a11,
     author = {A. Kr\"oner and H. Kr\"oner},
     title = {Hyperplane {Separation} {Type} {Theorems} in {Hadamard} {Manifolds}},
     journal = {Journal of convex analysis},
     pages = {519--529},
     year = {2022},
     volume = {29},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JCA_2022_29_2_JCA_2022_29_2_a11/}
}