@article{CRMATH_2018__356_11-12_1188_0,
     author = {Tatsien Li and Bopeng Rao},
     title = {Kalman's criterion on the uniqueness of continuation for the nilpotent system of wave equations},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1188--1194},
     publisher = {Elsevier},
     volume = {356},
     number = {11-12},
     year = {2018},
     doi = {10.1016/j.crma.2018.09.006},
     language = {en},
}