no. 1
Semidiscrete and single step fully discrete finite element approximations for second order hyperbolic equations with nonsmooth solutions
ESAIM: Modélisation mathématique et analyse numérique, Tome 27 (1993) no. 1, pp. 55-63. 
@article{M2AN_1993__27_1_55_0,
     author = {Bales, L. A.},
     title = {Semidiscrete and single step fully discrete finite element approximations for second order hyperbolic equations with nonsmooth solutions},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {55--63},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {27},
     number = {1},
     year = {1993},
     mrnumber = {1204628},
     zbl = {0766.65082},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1993__27_1_55_0/}
}
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Bales, L. A. Semidiscrete and single step fully discrete finite element approximations for second order hyperbolic equations with nonsmooth solutions. ESAIM: Modélisation mathématique et analyse numérique, Tome 27 (1993) no. 1, pp. 55-63. http://www.numdam.org/item/M2AN_1993__27_1_55_0/

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