Okamoto, Yoshio

• The Electronic Journal of Combinatorics Volume 17 (2010) - Notes
  A Tight Lower Bound for Convexly Independent Subsets of the Minkowski Sums of Planar Point Sets
  Abstract  PDF
• The Electronic Journal of Combinatorics Volume 18, Issue 1 (2011) - Papers
  The $t$-Pebbling Number is Eventually Linear in $t$
  Abstract  PDF