@article{JCA_2021_28_1_JCA_2021_28_1_a4,
     author = {R. Haller and K. Pirk and T. Veeorg},
     title = {Daugavet- and {Delta-Points} in {Absolute} {Sums} of {Banach} {Spaces}},
     journal = {Journal of convex analysis},
     pages = {41--54},
     year = {2021},
     volume = {28},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JCA_2021_28_1_JCA_2021_28_1_a4/}
}