Miler, M.; Skalsky, M.: 'Stigmatically focusing grating coupler', Electronics Letters, 1979, 15, (10), p. 275-276, DOI: 10.1049/el:19790195
IET Digital Library, https://digital-library.theiet.org/;jsessionid=7vbdk2h32k2kb.x-iet-live-01content/journals/10.1049/el_19790195