@article{10_21136_CMJ_1980_101679,
     author = {Tuan, P. D. and Anh, V. V.},
     title = {Extremal problems for functions of positive real part with a fixed coefficient and applications},
     journal = {Czechoslovak Mathematical Journal},
     pages = {302--312},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1980},
     doi = {10.21136/CMJ.1980.101679},
     mrnumber = {566054},
     zbl = {0445.30006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1980.101679/}
}