Geodesic
On Four Circles for Four Points of a Triangle and on Two Circles for Eight Points of a Rectangular Triangle
Matematičeskoe obrazovanie, no. 4 (2006), pp. 20-26 
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, no. 4 (2006), pp. 20-26. http://geodesic.mathdoc.fr/item/MO_2006_4_a2/
@article{MO_2006_4_a2,
     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}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {20--26},
     year = {2006},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2006_4_a2/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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.