Reading links for Ihde:

http://www.sunysb.edu/philosophy/faculty/dihde/

http://www.janushead.org/9-2/Olsen.pdf

http://www.sfu.ca/~andrewf/Ihde1.htm

http://www.compilerpress.atfreeweb.com/Anno%20Ihde%20Epilogue%20Instrumental%20Realism%201991.htm