@article{SMJ2_2010_35_4_a2,
     author = {Shepelska, Varvara},
     title = {Plus-Minus {Property} as a {Generalization} of the {Daugavet} {Property}},
     journal = {Serdica Mathematical Journal},
     pages = {371--386},
     publisher = {mathdoc},
     volume = {35},
     number = {4},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2010_35_4_a2/}
}