In 1990, Nishizeki founded the annual International Symposium on Algorithms and Computation, and at the 18th symposium, in 2007, a workshop was held in honor of his 60th birthday.
Nishizeki founded the annual International Symposium on Algorithms and Computation, and at the 18th symposium. This was in 2007. This was what a workshop was held in honor of his 60th birthday. This was in 1990.