Useful references:

Chung CSY, Pollock A, Campbell T, Durward BR, Hagen S (2010) Cognitive rehabilitation for executive dysfunction in patients with stroke or other adult non-progressive acquired brain damage (Protocol). Cochrane Database of Systematic Reviews 2010, Issue 3. Art. No.: CD008391. DOI: 10.1002/14651858.CD008391

Intercollegiate Working Party Stroke (2008) National Clinical Guidelines for Stroke. Royal College of Physicians, London. P90

Lezak, MD (1982). The problem of assessing executive functions. International Journal of Psychology. 17, 281–297