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2. FREUD, G., On an inequality of Markov type. Dokladii A.N. SSSR 197 (1971) 790–793. English translation: Soviet Math. Dokl. 12 (1971) 570–573.
3. FREUD, G., A contribution to the problem of weighted polynomial approximation. ISNM vol.20 "Linear operators and approximation theory". Conference report (Oberwolfach, 1970). Editors: P.J.Butzer, J.P.Kahane and B.Sz.-Nagy, Birkhäuser Verl. Basel 1972.
4. Freud, G., On direct and converse theorems in the theory of weighted polynomial approximation. Math. Zeitschr. 134 (1972) 123–134.
5. Freud, G., On converse theorems of weighted polynomial approximation. Acta Math. Acad. Sci. Hung., in print.