By Valk Pierre J.   Simons Ries M.   Struyvenberg Paul A.   Kruit Hans   van Berge Henegouwen Marianne T.   in American Journal of Rhinology

ISSN:1539-6290|11|1|27-33

OceanSide Publications, Inc‎(1997)‎

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By Valk Pierre J. L.   Van Roon Dominique B.   Simons Ries M.   Rikken Ger   in Aviation, Space, and Environmental Medicine

ISSN:0095-6562|75|5|433-438

Aerospace Medical Association‎(2004)‎

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