1. Smooth interpolation in triangles;Barnhill;J. Approximation Theory,1973
2. Sard kernel theorems on triangular and rectangular domains with extensions and applications to finite element error bounds;Barnhill,1972
3. Blending function interpolation to boundary data on triangles;Barnhill,1972
4. Tricubic polynomial interpolation;Birkhoff,1971
5. G. Birkhoff and L. Mansfield, Compatible triangular finite elements, J. Math. Anal. Appl., to appear.