A Mercedes shop manual on CD available in the US. I'm not a fan of Mercedes hardcopy shop manuals to begin with, and the CD version is no improvement. A lot of information I would like to have on paper as I'm working on the my is okay on screen but illegible once printed (even when printed on a high end laser printer). Unfortunately, the Mercedes manual is the only source for a lot of non engine procedures. And it doesn't cover the transmission either.
I got a Haynes manual for the UK W124 series. It covers just about any service I'd perform myself on a M103 engine. I got mine from http://www.whsmith.co.uk
for something like L18 shipped to the US. You can also order directly from http://www.haynes.com.
There is a link to Haynes in Sweden so maybe you can find a manual in Swedish.