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@article{HoffschmidtPitzPaalBoehmer1997,
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  isbn      = {0038-092X},
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@article{HoffschmidtFendJorgensen2002,
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  series = {Renewable energy for local communities of Europe : (toward Rio+10) ; proceedings / EuroSun 2002, the 4th ISES Europe Solar Congress ; Bologna (Italy), 23 - 26 June 2002 / ISES Italia},
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@article{KernSchelthoffMathieu2011,
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  series = {Proceedings / organised by: ISES Europe ... [Ed.: Deutsche Gesellschaft f{\"u}r Sonnenenergie e.V. - DGS, Munich ; PSE GmbH - Forschung Entwicklung Marketing, Freiburg]. - Vol 1},
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  isbn      = {3-9809656-1-9},
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}