Geodesic
On Four Circles for Four Points of a Triangle and on Two Circles for Eight Points of a Rectangular Triangle
Matematičeskoe obrazovanie, Tome 39 (2006) no. 4, pp. 20-26.

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16 remarkable points of an arbitrary triangle lie on four circles, four points on each circle. In the case of a rectangular triangle they lie on 2 circles, 8 points on each circle. 
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     author = {E. D. Kulanin},
     title = {On {Four} {Circles} for {Four} {Points} of a {Triangle} and on {Two} {Circles} for {Eight} {Points} of a {Rectangular} {Triangle}},
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E. D. Kulanin. On Four Circles for Four Points of a Triangle and on Two Circles for Eight Points of a Rectangular Triangle. Matematičeskoe obrazovanie, Tome 39 (2006) no. 4, pp. 20-26. http://geodesic.mathdoc.fr/item/MO_2006_39_4_a2/