Crust
Mix graham crumbs and butter. Press into bottom of pan.
Filling
Beat cream cheese and sugar.
Add lemon zest, lemon juice, lime zest, lime juice, and vanilla; mix.
Blend in flour.
Add eggs, 1 at a time, beating until blended.
Pour over crust.
Bake 35 to 40 minutes until center is almost set.
Run knife around rim; cool before removing rim.
Refrigerate 4 hours.
Beat whipping cream until stiff peaks form, gradually adding icing sugar after soft peaks form.
Spread over cheesecake.
