no. 1
Boundary values for Sobolev-spaces with weights. Density of D(Ω)inW p,γ 0 ,⋯,γ r s (Ω)andinH p,γ 0 ,⋯,γ r s (Ω) for s > 0 and r=s-1 p -
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 1, pp. 73-96 
@article{ASNSP_1973_3_27_1_73_0,
     author = {Triebel, Hans},
     title = {Boundary values for {Sobolev-spaces} with weights. {Density} of $D (\Omega ) \text{ in } W^s_{p, \gamma _0, \dots , \gamma _r} (\Omega ) \text{ and in } H^s_{p, \gamma _0, \dots , \gamma _r} (\Omega )$ for $s$ > $0$ and $r = \left[s - \frac{1}{p}\right]^-$},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {73--96},
     year = {1973},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 27},
     number = {1},
     zbl = {0258.46033},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1973_3_27_1_73_0/}
}
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Triebel, Hans. Boundary values for Sobolev-spaces with weights. Density of $D (\Omega ) \text{ in } W^s_{p, \gamma _0, \dots , \gamma _r} (\Omega ) \text{ and in } H^s_{p, \gamma _0, \dots , \gamma _r} (\Omega )$ for $s$ > $0$ and $r = \left[s - \frac{1}{p}\right]^-$. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 1, pp. 73-96. https://www.numdam.org/item/ASNSP_1973_3_27_1_73_0/

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