Magar, S.S.; Cooper, D.C.: 'Fast logarithmic d.a. conversion with small error', Electronics Letters, 1976, 12, (4), p. 106-107, DOI: 10.1049/el:19760083
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1mnt4msew3iw6.x-iet-live-01content/journals/10.1049/el_19760083