Technical review : Optical filters and their use with the type 1302 & type 1306 photoacoustic gas monitors /
Christensen, Jorgen
Technical review : Optical filters and their use with the type 1302 & type 1306 photoacoustic gas monitors / Jorgen Christensen - [s.l.] : Brüel & Kjaer, 1990 - 50 p.;, 21 cm.
621.383