References: The Interior distance ratio in quadrilaterals and inequalities for rings

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Apostol , T. M. 1957 . Mathematical Analysis , Addison-Wesley .
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Chinak , M. A. 1986 . Isoperimetric properties of the module and quasiconformal mappings . Siberian Math. J , 27 ( 4 ) : 591 – 598 . translated from Sibirskii Matematicheskii Zhurnal 27 (4) (1986). 152-160.
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Grötzsch , H. 1932 . Akademie der Wissenschaften, Leipzig, Math.-Naturw. Kl., Berichte , 84 ( 4 ) : 3 – 14 .
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Lehto , O. and Virtanen , K. I. 1957 . Quasiconformal Mappings in the Plane , Addison-Wesley,Springer-Verlag .
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