Mathias, Kirk E.  <br/><br/>
Can a smartphone application improve girls' physical activity behavior during weekend/ / 
Kirk E. Mathias. 
 - Virginia ;   American Alliance for Health,   November-December 2020. 
 - Volume 91,pages 56. 
<br/><br/><label>Dewey Class. No.: </label>DPer613.7105 J74 January-December 2020 v91 no 1-9