: 'Tunable, fourth-order silicon microring-resonator add-drop filters', IET Conference Proceedings, 2007, p. 123-123, DOI: 10.1049/ic:20070077
IET Digital Library, https://digital-library.theiet.org/;jsessionid=4ubtkr1992ttl.x-iet-live-01content/conferences/10.1049/ic_20070077