@article{GDZPPN002082403, title = {A generalization of Nagel's middlespoint.}, journal = {Elemente der Mathematik}, volume = {45}, year = {1990}, pages = {14-18}, zbl = {0701.51009}, url = {http://dml.mathdoc.fr/item/GDZPPN002082403} }
Eddy, R.H. A generalization of Nagel's middlespoint.. Elemente der Mathematik, Tome 45 (1990) pp. 14-18. http://gdmltest.u-ga.fr/item/GDZPPN002082403/