Lofgren, R <br/><br/>
The Effect of Low Temperature on the Spirochetes of Relapsing Fever: I. The Viability of Four Strains of Spirochetes Stored at -48 Degrees Centigrade.  [electronic resource] 

 -  Journal of bacteriology  Sep 1945 
 - 305-11 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0021-9193 
<br/><br/><label>Standard No.: </label>10.1128/JB.50.3.305-311.1945  doi