1. Knotted Surfaces and Their Diagrams;Carter,1998
2. The lower bound of the w-indices of non-ribbon surface-links;Hasegawa;Osaka J. Math.,2004
3. Minimal n-charts with four white vertices;Ishida;J. Knot Theory Ramif.,2011
4. Surfaces in R4 of braid index three are ribbon;Kamada;J. Knot Theory Ramif.,1992
5. 2-dimensional braids and chart descriptions;Kamada,1993