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| web | Jasper Faber and Arno Schroten | CE Delft | 2012-01-01 |
| web | Jasper Faber and Arno Schroten | CE Delft | 2012-01-01 |
| web | Jasper Faber and Arno Schroten | CE Delft | 2012-01-01 |
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| web | National Research Council of t... | | 2009-01-01 |
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