SELECT  ?author
WHERE   { ?author
          <http://www.w3.org/2000/01/rdf-schema#label>
          "Amit P. Sheth" }

SELECT  ?title
WHERE   { ?author
                <http://www.w3.org/2000/01/rdf-schema#label>
                "Amit P. Sheth" .
          ?author
                <http://lsdis.cs.uga.edu/proj/semdis/testbed/#listed_author_in>  
                ?publication .
          ?publication 
                <http://www.w3.org/2000/01/rdf-schema#label>
                ?title
        }

# a bigger "join" select

SELECT  ?authorName
WHERE   { ?author
                <http://www.w3.org/2000/01/rdf-schema#label>
                ?authorName .
          ?author
                <http://lsdis.cs.uga.edu/proj/semdis/testbed/#listed_author_in>  
                ?publication .
          ?publication 
                <http://www.w3.org/2000/01/rdf-schema#label>
                ?title .
          FILTER ( ?title = "Efficient Algorithms for the Smallest Enclosing Cylinder Problem." )
        }

A Sparql query over http

http://gumbo.cs.uga.edu/viz-bin/sparql.fcgi?SELECT+%3Fauthor+%3Fname+WHERE+%7B+%3Fauthor+%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23label%3E+%3Fname+FILTER%0A+(+REGEX+(+%3Fname%2C+%22.*Leonidas.*%22))+%7D