Interpolation by Multivariate spline , Department of Mathematics, University of Mannheim, Germany, Feb. 3rd, 1992.

Smooth surface interpolation, Department of Mathematics, University of Siegen, Germany, Feb. 5, 1992.

Smooth surface interpolation, Department of Mathematics, University of Dortmund, Germany, Feb. 10, 1992.

Linear and non-linear smooth surface interpolation, An invited talk on the International Symposium on Numerical Analysis, University of Antwerp, Belgium, April 9, 1992.

Multivariate spline and its applications, Department of Mathematics, Hong Kong Baptist College, Hong Kong, June 29, 1992.

Non-linear Approximation by splines, The First China-Japan Joint Seminar on Numerical Analysis, August 24-29, 1992, Beijing.

Linear and non-linear multivariate spline, An invited talk on "New Aspects of Numerical Analysis in the Light of Recent Technology", Sept.13-18, 1993, Stresa, Italy.

Applications of the multivariate spline to science and technology, Second invited talk on "New Aspects of Numerical Analysis in the Light of Recent Technology", Sept.13-18, 1993, Stresa, Italy.

Open problems, Third invited talk on "New Aspects of Numerical Analysis in the Light of Recent Technology", Sept.13-18, 1993, Stresa, Italy.

A series of lectures on Multivariate Approximation, Mathematics Department, University of Milano, Sept. 21--Oct. 24, 1993, Milano, Italy.