Aaltaris,
https://books.google.es/books?id=JMyClio8BmUC
https://books.google.es/books?id=JMyClio8BmUC
http://www.springer.com/it/book/9783642316739
http://www.springer.com/it/book/9783642316739
http://www.springerlink.com/content/q372m6l058172752/?MUD=MP Note the authors...