Rydbeck, Olof E.H. <br/><br/>
the propagation of waves in an inhomogeneus medium / by Olo-f E.H. Rydbeck. 

 - Gothenburg, Sweden : CHUT 
 - 34 p. 
 - Chalmers University of Technology ; nr. 74 .
<br/><br/> "Reports from the Research Laboratory of Electronics ; nr. - 7".