1
Gehring F W. Characteristic properties of quasidisks[C]., 1982.
2
Krushkal S L. Grunsky coefficient inequalities, Caratheodory metric and extremal quasiconformal mappings[J]. Commentarii Mathematici Helvetici, 1989, 64(1): 650-660.
3
Dmitry Khavinson · Mihai Putinar · Harold S Shapiro. Poincaré’s Variational Problem in Potential Theory. 2006.
4
Anderson J M. The Fredholm eigenvalues of plane domains[J]. Complex Variables and Elliptic Equations, 1986, 5(2): 111-116.
5
Gehring F W. Characterizations of quasidisks[C]., 1999, 48(1): 11-41.
6
Lyzzaik A. Univalence Criteria for Harmonic Mappings in Multiply Connected Domains[J]. Journal of The London Mathematical Society-second Series, 1998, 58(01): 163-171.
7
Kuhnau R. Zu den Grunskyschen Koeffizientenbedingungen[C]., 1981: 125-130.
8
Otto Hbner. Die Faktorisierung konformer Abbildungen und Anwendungen. 1966.
9
Schober G. Estimates for fredholm eigenvalues based on quasiconformal mapping[C]., 1973: 211-217.
10
Schiffer M, Schober G. An extremal problem for the Fredholm eigenvalues[J]. Archive for Rational Mechanics and Analysis, 1971, 44(2).