Reference:
Kaisa Nyberg. Correlation theorems in cryptanalysis. Discrete Applied Mathematics, 111:177–188, 2001.
Suggested BibTeX entry:
@article{nyberg:dam01, author = {Kaisa Nyberg}, journal = {Discrete Applied Mathematics}, pages = {177--188}, publisher = {Elsevier}, title = {Correlation theorems in cryptanalysis}, volume = {111}, year = {2001}, }