Lehto, Olli <br/><br/>
Value Distribution and Boundary Behaviour of a Function of Bounded Characteristic and the Riemann Surface of its Inverse Function 

 - Helsinki :   Suomalainen Tiedeakatemia,   1954. 
 - 45 p. ;   22 cm. 
 - Annales Academiae Scientiarum Fennicae ;   177 .