I am currently looking at a paper where, in the appendix, it talks about the Dirichlet-Neumann operator. However, rather than giving detailed proofs, it is more like listing all the properties. I have already looked at some references, such as PDE I and II by Michael Tylor and distributions and operators by Gerd Grubb. Now the problem is, it seems that Michael's book is not sufficient, and the second book is not very readable(and not sufficient either). Can someone recommend some other references that include the results mentioned in this paper? I have attached a screenshot of the paper. Thanks in advance! 
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