The formal reference of DIVA 2.0 is:
JJS Kooij. Adult ADHD. Diagnostic assessment and treatment, 3rd ed. Springer, 2012
This book can be ordered at: http://www.springer.com/medicine/psychiatry/book/978-1-4471-4137-2
The first study in which DIVA 2.0 was used, is an epidemiological study on ADHD in older adults in the Dutch population.
For Validations click this link.