Webdynpro ABAP

Hi,

I have some idea on Webdynapro Java.

Now i need to learn webdynpro ABAP.

can you please tell me some good books/materials for webdynpro abap to start with.

For example: i have gone thru JA310, JA312 for webdynpro java...

Like wise are there any materials for webdynpro abap?

Thanks & Regards,

Raju