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Siebren van der Werf, Reworking Slocum's Navigation, Yachting Monthly, April (1995)42-44.  1056k v. 1 Feb 14, 2011, 4:18 AM vdwerf@kvi.nl
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Siebren van der Werf, The lunar distance method in the nineteenth century: A simulation of Joshua Slocum's observation on June 16, 1896, Navigation, Journal of the Institute of Navigation, 44(1997)1. (This article was awarded the Samuel Burka Award 1997 of the ION).   1181k v. 1 Apr 13, 2010, 6:09 AM vdwerf@kvi.nl
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A better legible version of 1997_Lunars_Nav  479k v. 1 Apr 13, 2010, 6:17 AM vdwerf@kvi.nl
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Siebren van der Werf, Astronomical observations during Willem Barents's third voyage to the North (1596-1597), ARCTIC 51(1998)142-154   630k v. 1 Jul 14, 2015, 12:18 AM vdwerf@kvi.nl
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Siebren Y. van der Werf, Günther P. Können, Waldemar H. Lehn, Frits Steenhuisen en Wayne P. S. Davidson, Gerrit de Veer's true and perfect description of the Novaya Zemlya effect, Applied Optics 42(2003)379-389.   1174k v. 1 Apr 13, 2010, 6:12 AM vdwerf@kvi.nl
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Siebren Y. van der Werf, Günther P. Können en W. H. Lehn, The Novaya Zemlya effect and sunsets, Applied Optics 42(2003)367-378.   2072k v. 1 Apr 13, 2010, 6:12 AM vdwerf@kvi.nl
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An erratum to eq. 21 in 2003_Refraction_AO.pdf  3k v. 1 Apr 18, 2010, 8:23 AM vdwerf@kvi.nl
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Siebren Y. van der Werf, Raytracing and refraction in the modified US1976 atmosphere, Applied Optics 42(2003)354-366.   229k v. 1 Apr 13, 2010, 6:10 AM vdwerf@kvi.nl
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Waldemar H. Lehn en Siebren van der Werf, Atmospheric refraction: a history., Applied Optics 44(2005)5624.   926k v. 1 Apr 13, 2010, 6:08 AM vdwerf@kvi.nl
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Wayne P.S. Davidson en Siebren Y. van der Werf, The Toboggan Sun., Applied Optics 44(2005)5644.   2882k v. 1 Apr 13, 2010, 6:06 AM vdwerf@kvi.nl
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Siebren Y. van der Werf, Comment on “Improved ray tracing air mass numbers model”, Applied Optics 47(2008)153-156.    66k v. 2 Sep 28, 2011, 2:06 AM vdwerf@kvi.nl
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Siebren Y van der Werf, Noninverted images in inferior mirages, Applied Optics 50(2011)F12-F15.  1139k v. 1 Aug 16, 2011, 4:44 AM vdwerf@kvi.nl
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Gunther P Können and Siebren Y van der Werf, Reflection halo twins: subsun and supersun, Applied Optics 50(2011)F80-F88.  2031k v. 4 Sep 28, 2011, 2:05 AM vdwerf@kvi.nl
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Siebren van der Werf and Igor Shokaryev, Wave Height and Horizon Dip, Navigation 62(2015)161-169   656k v. 1 Jul 13, 2015, 11:56 PM vdwerf@kvi.nl