@article{DOCMA_1997__2__a2,
     author = {Hertrich-Jeromin, Udo},
     title = {Supplement on curved flats in the space of point pairs and isothermic surfaces: {A} quaternionic calculus},
     journal = {Documenta mathematica},
     pages = {335--350},
     publisher = {mathdoc},
     volume = {2},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_1997__2__a2/}
}