The official INTERACT 2013 Proceedings is availbale in 4 volumes published by Springer:
Volume 1: http://link.springer.com/book/10.1007/978-3-642-40483-2/page/1
Volume 2: http://link.springer.com/book/10.1007/978-3-642-40480-1/page/1
Volume 3: http://link.springer.com/book/10.1007/978-3-642-40477-1/page/1
Volume 4: http://link.springer.com/book/10.1007/978-3-642-40498-6/page/1