@incollection{JEDP_2004____A12_0,
     author = {Ping Zhang and Yuxi Zheng},
     title = {On the {Global} {Existence} of {Weak} {Solutions} to {A} {Nonlinear} {Variational} {Wave} {Equation}},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {12},
     pages = {1--12},
     publisher = {Groupement de recherche 2434 du CNRS},
     year = {2004},
     doi = {10.5802/jedp.12},
     mrnumber = {2135607},
     zbl = {1068.35074},
     language = {en},
     url = {https://proceedings.centre-mersenne.org/articles/10.5802/jedp.12/}
}