On the maximum of $a_4 - 3a_2 a_3 + μa_2$ and some related functionals for bounded real univalent functions

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Z. J. Jakubowski, H. Siejka, O. Tammi Annales Polonici Mathematici 46 (1985), 115-128 DOI: 10.4064/ap-46-1-115-128