@article{JEDP_1999____A19_0,
     author = {Zuazua, Enrique},
     title = {Some uniqueness and observability problems arising in the control of vibrations},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {19},
     pages = {1--8},
     publisher = {Universit\'e de Nantes},
     year = {1999},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1999____A19_0/}
}