- ISOPHOT Observer's Manual, eds.: U. Klaas, H. Krüger, I. Heinrichsen, A. Heske, R. Laureijs, Version 3.1 (7 April 1994)
- Addendum to ISOPHOT Observer's Manual, eds: R.J. Laureijs, U. Klaas, D. Lemke, U. Herbstmeier, P. Abraham, Version 1.0 (5 August 1996)
- Helpdesk note to PHT observers on April 11, 1996
The first two documents can be found in the WWW at:
``http://www.iso.vilspa.esa.es/manuals/iso_pht/om311.html''
and
``http://www.iso.vilspa.esa.es/manuals/PHT_add/supcall11.html''
respectively, or can be retrieved as LATEX or postscript files from the ftp server:
``ftp.estec.esa.nl/pub/supp_call/PHT_add''