TY - JOUR TI - Some extremal problems concerning polynomials T3 - Acta scientiarum mathematicarum AU - Shi Ying Guang PY - 1995 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/15572/1/math_061_numb_251-259.pdf ER -