Andrej Bogdanov Periklis A. Papakonstantinou Andrew Wan Pseudorandomness for Linear Length Branching Programs and Stack Machines. 447-458 2012 APPROX-RANDOM https://doi.org/10.1007/978-3-642-32512-0_38 conf/approx/2012 db/conf/approx/approx2012.html#BogdanovPW12