@article{10_21136_CMJ_1971_101037,
author = {Preiss, David},
title = {Approximate derivatives and {Baire} classes},
journal = {Czechoslovak Mathematical Journal},
pages = {373--382},
year = {1971},
volume = {21},
number = {3},
doi = {10.21136/CMJ.1971.101037},
mrnumber = {0286951},
zbl = {0221.26007},
language = {en},
url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1971.101037/}
}
Preiss, David. Approximate derivatives and Baire classes. Czechoslovak Mathematical Journal, Tome 21 (1971) no. 3, pp. 373-382. doi: 10.21136/CMJ.1971.101037
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