La Union mathematicians grab 18 medals in international tilt. 

 - San Fernando City, La Union :  The Philippine Star,  September 17, 2015. 
<br/><br/>In:  The Philippine Star (September 17, 2015), column 3-5,  page B18 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Competition.<br/>Rewards.