no. 1
Basic compactness properties of nonconforming and hybrid finite element spaces
RAIRO. Analyse numérique, Tome 14 (1980) no. 1, pp. 81-115. 
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     author = {Stummel, Friedrich},
     title = {Basic compactness properties of nonconforming and hybrid finite element spaces},
     journal = {RAIRO. Analyse num\'erique},
     pages = {81--115},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {14},
     number = {1},
     year = {1980},
     mrnumber = {566091},
     zbl = {0456.65061},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1980__14_1_81_0/}
}
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Stummel, Friedrich. Basic compactness properties of nonconforming and hybrid finite element spaces. RAIRO. Analyse numérique, Tome 14 (1980) no. 1, pp. 81-115. http://archive.numdam.org/item/M2AN_1980__14_1_81_0/

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