1. Triple points and surgery of immersed surfaces;Banchoff, Thomas F.;Proc. Amer. Math. Soc.,1974
2. A duality theorem for Willmore surfaces;Bryant, Robert L.;J. Differential Geom.,1984
3. 3. R. Bryant, Personal communication, 1985.
4. 4. C. Costa, Imersões minimas completas em R, Doctoral thesis, IMPA, Rio de Janeiro, Brasil, 1982.
5. 5. G. Francis, Some equivariant eversions of the sphere (privately circulated manuscript), 1977.