Zingg, Matthias A <br/><br/>
Analysis of participation and performance in athletes by age group in ultramarathons of more than 200 km in length.  [electronic resource] 

 -  International journal of general medicine  2013 
 - 209-20 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1178-7074 
<br/><br/><label>Standard No.: </label>10.2147/IJGM.S43454  doi