@article{oai:ipsj.ixsq.nii.ac.jp:00060346,
 author = {Masaru, Takata and Masaru, Takata},
 issue = {0},
 journal = {Information Processing in Japan},
 month = {Jan},
 pages = {46--50},
 title = {The Programmed Digital Differential Analyzer},
 volume = {1},
 year = {1961}
}