1. S. N. Bernstein, Collected Works (Izd. AN SSSR, Moscow–Leningrad, 1954), Vol. 2 [in Russian].
2. A. N. Morozov, “Analog of Bernstein’s theorem in the space L1,” Mat. Zametki 57 (5), 699–703 (1995) [Math. Notes 57 (5–6), 485–488 (1995)].
3. A. N. Morozov, “On a description of spaces of differentiable functions,” Mat. Zametki 70 (5), 758–768 (2001) [Math. Notes 70 (5–6), 688–697 (2001)].
4. Yu. A. Brudnyi, “Criteria for the existence of derivatives in Lp,” Mat. Sb. 73 (115) (1), 42–64 (1967) [Math. USSR-Sb. 2 (1967), 35–55 (1968)].
5. Yu. A. Brudnyi, “Spaces defined bymeans of local approximations,” in Tr. Mosk. Mat. Obshch. (Izd. Moskov. Univ., Moscow, 1971), Vol. 24, pp. 69–132 [in Russian].