Yoshikawa, Hidekazu. <br/><br/>
approximate calculation method of the "lamda", wp and wd ei-genvalue problem of the group diffusion equation / Hidekazu- Yoshikawa and Jiro Wakabayashi. 

 - Kyoto, Japón : Kyoto University, Engineering Research Institute  TRB 
 - [11] p. 
 - Reprint; No.11 .
<br/><br/> "Reprinted from: Journal of Nuclear Science and Technology,- Vol.7, No.7, pp.355 - 365, july 1970".