@Article{ BonGus19, author = { Bonicatto, Paolo and Gusev, Nikolay }, title = { Non-uniqueness of signed measure-valued solutions to the continuity equation in presence of a unique flow }, journal = { Atti Accad. Naz. Lincei Cl. Sci. Fis. Mat. Natur. }, year = { 2019 }, doi = { 10.4171/RLM/858 }, volume = { 30 }, number = { 3 }, pages = { 511-531 }, URL = { http://cvgmt.sns.it/paper/4550/ }, note = { cvgmt preprint} }