Geodesic
Some Remarks on Continuous Orthogonal Expansions, and Eigenfunction Expansions for Positive Self-Adjoint Elliptic Operators with Variable Coefficients.
Mathematica Scandinavica, Tome 17 (1965), pp. 56-64.

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Mots-clés : functional analysis 
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     author = {Jaake Peetre},
     title = {Some {Remarks} on {Continuous} {Orthogonal} {Expansions,} and {Eigenfunction} {Expansions} for {Positive} {Self-Adjoint} {Elliptic} {Operators} with {Variable} {Coefficients.}},
     journal = {Mathematica Scandinavica},
     pages = {56--64},
     publisher = {mathdoc},
     volume = {17},
     year = {1965},
     zbl = {0148.13002},
     url = {http://geodesic.mathdoc.fr/item/MS2_1965__17_165924/}
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Jaake Peetre. Some Remarks on Continuous Orthogonal Expansions, and Eigenfunction Expansions for Positive Self-Adjoint Elliptic Operators with Variable Coefficients.. Mathematica Scandinavica, Tome 17 (1965), pp. 56-64. http://geodesic.mathdoc.fr/item/MS2_1965__17_165924/