@article{JGG_2005_9_2_JGG_2005_9_2_a2,
     author = {P. Pech },
     title = {On the {Simson-Wallace} {Theorem} and its {Generalizations}},
     journal = {Journal for geometry and graphics},
     pages = {141--153},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/JGG_2005_9_2_JGG_2005_9_2_a2/}
}