Ogawa, K.; Tsuchiya, S.; Kawakami, H.; Tsutsui, T.: 'Humidity-sensing effects of optical fibres with microporous SiO2 cladding', Electronics Letters, 1988, 24, (1), p. 42-43, DOI: 10.1049/el:19880029 IET Digital Library, https://digital-library.theiet.org/;jsessionid=b6b3gfdm1m64.x-iet-live-01content/journals/10.1049/el_19880029