[F 1] FROLÍK Z.: 
Absolute Borel and Souslin sets. Pacific J. Math. 32 (1970), 663-683. 
MR 0265171[F 2] FROLÍK Z.: 
Topological methods in measure theory and the theory of measurable spaces. Proc. 3rd Prague Symposium on general topology. Academia, Prague 1972. 
MR 0372141[F 3] FROLÍK Z.: Uniform methods in the theory of measurable spaces. to appear.
[F 4] FROLÍK Z.: Correspondence technique in non-separable descriptive theory. to appear.
[H 1] HANSELL R. W.:  PhD dissertation, Rochester, 1970.
[H 2] HANSELL R. W.: 
On hyper-Borel sets. to appear in Bull. Amer. Math. Soc. 
MR 0294138[H 3] HANSELL R. W.: 
On the non-separable theory of k-Borel and H-Souslin sets. I. To appear in General Topology and Appl. 1972. 
MR 0319170[1] K. KURATOWSKI: Topologie I. Warszawa 1952.
[2] D. MONTGOMERY: 
Non-separable metric spaces. Fund. Math. 25 (1935), 527-534. 
Zbl 0012.32102