Meir M. Lehman Juan F. Ramil Paul Wernick Dewayne E. Perry Wladyslaw M. Turski Metrics and Laws of Software Evolution - The Nineties View. 20- 1997 conf/metrics/1997 IEEE METRICS http://csdl.computer.org/comp/proceedings/metrics/1997/8093/00/80930020abs.htm db/conf/metrics/metrics1997.html#LehmanRWPT97