Heilig, R. <br/><br/>
contribution to the theory of box-girders of arbitrary cros-s-sectional shape / R. Heilig. 

 - London : Cement and Concrete Association 
 - 25 p. 
 - Library translation ; no. 145 / Cement and Concrete Associa-tion .
<br/><br/> Traducido del Aleman.