@article{CRMATH_2002__334_7_545_0,
     author = {Ren\'e D\'ager and Enrique Zuazua},
     title = {Spectral boundary controllability of networks of strings},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {545--550},
     publisher = {Elsevier},
     volume = {334},
     number = {7},
     year = {2002},
     doi = {10.1016/S1631-073X(02)02314-2},
     language = {en},
}