@article{ELMA_1990__45_6_141483,
     author = {S.J. Bilchev and E.A. Velikova},
     title = {On a certain triangle transformation and some of its applications.},
     journal = {Elemente der Mathematik},
     pages = {70--75},
     publisher = {mathdoc},
     volume = {45},
     number = {6},
     year = {1990},
     zbl = {0714.51009},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1990__45_6_141483/}
}