@article{oai:nagoya.repo.nii.ac.jp:02001760,
 author = {NINOMIYA, Ichizo},
 issue = {2},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Feb},
 pages = {115--124},
 title = {On the number of types of symmetric boolean output matrices},
 volume = {7},
 year = {1956}
}