@article{10_4064_ap83_2_4,
     author = {M. A. Magid},
     title = {Lorentzian isothermic surfaces and {Bonnet} pairs},
     journal = {Annales Polonici Mathematici},
     pages = {129--139},
     publisher = {mathdoc},
     volume = {83},
     number = {2},
     year = {2004},
     doi = {10.4064/ap83-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap83-2-4/}
}