@article{CRMATH_2011__349_11-12_673_0,
     author = {Micu, Sorin and Zuazua, Enrique},
     title = {On the regularity of null-controls of the linear 1-d heat equation},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {673--677},
     publisher = {Elsevier},
     volume = {349},
     number = {11-12},
     year = {2011},
     doi = {10.1016/j.crma.2011.05.005},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2011.05.005/}
}