1. Harmonic maps in unfashionable geometries;Burstall;Manuscripta Mathematica,2002
2. Lie Sphere Geometry;Cecil,2008
3. Vorlesungen über Differentialgeometrie III: Differentialgeometrie der Kreise und Kugeln;Blaschke,1929
4. Soliton surfaces and their applications (soliton geometry from spectral problems);Sym,1985
5. The Ribaucour transformation in Lie sphere geometry;Burstall;Differential Geometry and its Applications,2006