Kohonen, Teuvo <br/><br/>
Contributions to the Study of Lifetimes of Positrons in Solids 

 - Helsinki :   Suomalainen Tiedeakatemia,   1961. 
 - 79 p. :   il. ;   21 cm. 
 - Annales Academiae Scientiarum Fennicae ;   92 .