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Christoph Helsper (2)
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1987 (2)
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German (2)
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Theoretische Bestimmung des Abscheidegrades eines Filters bei verschiedenen Betriebszuständen / Bartz, H. ; Helsper, C.
(1987)
Christoph Helsper
;
H. Bartz
Determination and Neutralization of the Charge Produced by the Dispersion of Powders
(1987)
Christoph Helsper
;
W. Mölter
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