H. Haruki et Tm. Rassias, A NEW CHARACTERISTIC OF MOBIUS TRANSFORMATIONS BY USE OF APOLLONIUS QUADRILATERALS, Proceedings of the American Mathematical Society, 126(10), 1998, pp. 2857-2861
The purpose of this paper is to give a new invariant characteristic pr
operty of Mobius transformations from the standpoint of conformal mapp
ing. To this end a new concept of ''Apollonius quadrilaterals'' is use
d.