1. Snake-like continua;Bing, R. H.;Duke Math. J.,1951
2. Monografie Matematyczne, Tom 44;Borsuk, Karol,1967
3. Multi-valued functions and partial order;Capel, C. E.;Portugal. Math.,1958
4. Retracting fans onto finite fans;Fugate, J. B.;Fund. Math.,1971
5. Small retractions of smooth dendroids onto trees;Fugate, J. B.;Fund. Math.,1971