Scott Kersey's papers at ftp.cs.wisc.edu/Approx

These files can be obtained by anonymous from ftp.cs.wisc.edu/Approx. The files are postscript, and are also available as compress(ed) files, as indicated by the subscript .Z, to be uncompress(ed) before using, as well as as (shorter) gzip(ed) files, as indicated by the subscript .gz, to be extracted by gzip -d .
The files are now also available in pdf. For those from before '98, these pdf files might not look very good in an acrobat reader, but will print just fine.
If you have trouble because of file contamination, specify binary as your first command in ftp.
The files are in order of increasing age.

mixed: ps ps.Z ps.gz pdf
On mixed interpolating-smoothing splines and the $\nu$-spline
Scott Kersey
jun 1999

exists: ps ps.Z ps.gz pdf
Best near-interpolation by curves: existence and convergence
Scott Kersey
apr 1999

optimality: ps ps.Z ps.gz pdf
Best near-interpolation by curves: optimality conditions
Scott Kersey
apr 1999