David A. Umphress T. Dean Hendrix James H. Cross II Saeed Maghsoodloo Software visualizations for improving and measuring the comprehensibility of source code. 121-133 2006 60 Sci. Comput. Program. 2 http://dx.doi.org/10.1016/j.scico.2005.10.001 db/journals/scp/scp60.html#UmphressHCM06