@article{CRMATH_2017__355_10_1050_0,
     author = {Czy\.z, Rafa{\l} and Nguyen, Van Thien},
     title = {On a constant in the energy estimate},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {1050--1054},
     publisher = {Elsevier},
     volume = {355},
     number = {10},
     year = {2017},
     doi = {10.1016/j.crma.2017.09.019},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2017.09.019/}
}