1) The paper referenced contains 4 pages, so it should be available via IEEXplore. Moreover, you can find a copy on http://www.win.tue.nl/~aserebre/MSR2012.pdf
2) Since the survey is only one of the techniques we intend to use, and it will be augmented by analysing the data publicly available in the SE dump, I believe the selection bias is appropriately addressed. -- http://mail.python.org/mailman/listinfo/python-list
