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@article{MAN_1880__16_156878, author = {Burmester}, title = {Ueber das bifocal - ver\"anderliche {System.} {Hierzu} 2 {Tafeln}}, journal = {Mathematische Annalen}, pages = {89--111}, publisher = {mathdoc}, volume = {16}, year = {1880}, zbl = {11.0615.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1880__16_156878/} }
Burmester. Ueber das bifocal - veränderliche System. Hierzu 2 Tafeln. Mathematische Annalen, Tome 16 (1880), pp. 89-111. http://geodesic.mathdoc.fr/item/MAN_1880__16_156878/