@article{AFM_1967_391-410_a14,
     author = {M. Schiffer and O. Tammi},
     title = {On the fourth coefficient of univalent functions with bounded boundary rotation},
     journal = {Annales Fennici Mathematici},
     publisher = {mathdoc},
     volume = {391-410},
     year = {1967},
     doi = {10.5186/aasfm.1967.396},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1967.396/}
}