Try this: http://ciaoitalia.com/recipe14June2000.html

€A couple of month ago , I had Panettone from Italy that was so
€great~!!!
€
€and I could not forget the taste of it.
€
€so I made my mind to make my own Panettone.
€
€finally I found a recipe that seems good.
€
€but the thing is the recipe requires mother yeast called "madre" which
€the recipe does not say.
€
€I started to find the recipe for "madre".but i could not find any
€recipes at all.
€
€Does anyone know how to make it?
€
€I heard it takes up to 20 days, and it is based on
€fruits.........that's all I know.
€
€If I make Panettone with the traditional Italian sourdough starter "
€madre",
€
€I will send him or her (who let me know how to make it) the Panettone
€I made.
€
€Fedex does go anywhere in the world.
€
€ I promise.
€