A cogent analysis of the underlying complexity of software engineering. Each problem is new; software is the most complex thing humans have ever built; it is impossible to measure complexity of something given that product. Software is fractal in complexity (really?)
I. Herraiz, J. Gonzalez-Barahona, and G. Robles. International working conference on Mining software repositories, page 1--10. Leipzig, Germany, ACM, (2008)