Pihlo, O. A. L. <br/><br/>
On magnets :   Read before the Christiania Society of Sciences 

 - Christania :   A. W. Brogger,   1878. 
 - xiv, 130 p. ;   18 cm. 
<br/><br/> At the meeting held on 18th may and 15th june 1877, and published by that society