%0 Journal Article %A A. E. Livingston %A J. A. Pfaltzgraff %T Structure and extremal problems for classes of functions analytic in an annulus %J Colloquium Mathematicum %D 1980 %P 161-181 %V 43 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-43-1-161-181/ %R 10.4064/cm-43-1-161-181 %G en %F 10_4064_cm_43_1_161_181