Preheat oven to 325: Crust: Mix crumbs, brown sugar and butter press into the bottom of a 9 inch springform pan. Bake 10 minutes. Remove let cool. (If you are using a dark nonstick springform pan bake at 300)
Filling:Mix cream cheese, sugar, flour and vanilla at medium speed until well blended. Blend in juices and peels. Add eggs one at a time, mixing on low after each addition just until blended. Pour over crust. Bake 325 for 60 to 65 minutes or until center is set. (If using a dark nonstick springform pan bake at 300) After it cools, refrigerate at least 4 hours or overnight. I usually serve with whip cream and manderin orange slices(in a can, juice drained) just to make it pretty. Mine took 1 hour 15 minutes.