1. Optical fiber sensor for measuring refractive index;Takeo;Jpn. J. Appl. Phys.,1982
2. Fluid observation with an optical fiber photorefractometer;Takeo;Jpn. J. Appl. Phys.,1983
3. Optical fibre refractometer using attenuation of cladding modes;Harmer,1983
4. Experimental investigations on fiber optic liquid level sensors and refractometers;Spenner,1983
5. Untersuchungen zur Faseroptischen Refraktometrie;Haubenreisser;Exp. Tech. Phys.,1984