@article{SIGMA_2019_15_a16,
     author = {Hans Lundmark and Budor Shuaib},
     title = {Ghostpeakons and {Characteristic} {Curves} for the {Camassa{\textendash}Holm,} {Degasperis{\textendash}Procesi} and {Novikov} {Equations}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2019},
     volume = {15},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2019_15_a16/}
}