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One often reads that there are (at least) 43 special points on the nine point circle of triangle geometry. Can anybody give me a reference which contains an explicit description of them (preferably accessible i.e. on internet or in a good---but not great---university library)?

with thanks

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    What exactly do you mean by a special point? Are you looking for points which divide segment in a ratio, or point of concurrence,intersection of some lines or something else.2012-07-07
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    see the Weisstein page about the [Nine-Point Circle](http://mathworld.wolfram.com/Nine-PointCircle.html) and the link after (3) to the indices of the [Kimberling centers](http://faculty.evansville.edu/ck6/encyclopedia/ETC.html) as proposed by Joseph.2012-07-07
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    @Raymond: thanks, just what i was looking for, jbc2012-07-08
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    @jbc: you are welcome!2012-07-08

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