optical reference filter wavelength standard reference material

deep-water channel in the north channel

disease of one channel involving another channel

(thermo) reference material

137Cs reference inventory

3D forward looking reference map

3D reference system

5 reference

95% reference range

absolute cell reference

absolute reference

absolute reference frame

academic reference

acoustic reference

Acoustics--Reference

action frame of reference

action reference

action reference variable

address reference

address reference number