Elfie, your second link has a lot of the same results my search did, IE bunches of American pizzerias selling 'authentic' Italian pizza.
I was thinking the OP was looking more for what existed prior in Italy as opposed to what the Italian immigrants created in the US.
If you read some of the History of Pizza, it is pretty interesting stuff. The new craze around here in the Panera's and what not is 'flatbread' pizza, but turns out one of the original words for pizza was pinsa (sp?) meaning 'flatbread'. So, our newest craze is really more of a return to what pizza originally was...
Also, pizza in its earliest forms was often used as an edible plate for stews and thick broths, and had more in common with focaccia.
Boy, I sure do love my pizza!