| Huygens, Christian | <person> Dutch physicist, 1629-1695. See: Huygens' ocular, Huygens' principle. (05 Mar 2000) |
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| Doppler, Christian | <person> Austrian mathematician and physicist in U.S., 1803-1853. See: Doppler echocardiography, Doppler effect, Doppler phenomenon, Doppler shift, Doppler ultrasonography. (05 Mar 2000) |
| Kjelland, Christian | <person> Norwegian obstetrician, 1871-1941. See: Kjelland's forceps. (05 Mar 2000) |