1. A. Pełczyński, Linear Extensions, Linear Averagings and Their Applications to Linear Topological Classification of Spaces of Continuous Functions [Russian translation], Mir, Moscow (1970).
2. L. B. Shapiro, “On operators of extension of functions and normal functors,” Vestnik Moskov. Univ. Ser. I Mat. Mekh., No. 1, 35–42 (1992).
3. E. A. Michael, “A linear mapping between function spaces,” Proc. Amer. Math. Soc.,15, No. 2, 407–409 (1964).
4. Yu. È. Linke, “On the support sets of sublinear operators,” Dokl. Akad. Nauk SSSR,207, No. 3, 531–533 (1972).
5. R. Haydon, “On a problem of Pełczyński: Milutin spaces, Dugundji spaces and AE (0-dim),” Studia Math.,52, No. 1, 23–31 (1974).