On Approximating a Geometric Prize-Collecting Traveling Salesman Problem with Time Windows: Extended Abstract.

Reuven Bar-Yehuda Guy Even Shimon Shahar On Approximating a Geometric Prize-Collecting Traveling Salesman Problem with Time Windows: Extended Abstract. 55-66 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2832&spage=55 2003 conf/esa/2003 ESA db/conf/esa/esa2003.html#Bar-YehudaES03