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<p>by the <a href="page.php?w=University_of_Poitiers">Université de Poitiers</a> entities <a href="page.php?w=Institut_Pprime">CNRS' Institut Pprime</a> and the Laboratoire de Mathématiques et Applications revealed that the effect is due to internal waves moving the vessel back and forth. Two types occur. The first as observed by Nansen causes a constant abnormally slow progress. The second, Ekman type, causes speed oscillations. The Ekman type may be temporary and become Nansen type as the vessel escapes the particular regime causing the oscillating</p><p>
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