Below are word clouds based on the frequency of words in the abstract of my publications from different time periods.

• Abstract words 2006-2012
• Abstract words 2001-2005
• Abstract words 1996-2000
• Abstract words 1991-1995
• Abstract words 1991-

Abstract words 2006-2012

Abstract words 2001-2005

Abstract words 1996-2000

Abstract words 1991-1995

Abstract words 1991-