Any piece of info in particular you wanted sourced, or just all of it? You might need to whip out Google translate.
Jakobsson, Anders; Oscarsson, Magnus; Karlsson, Karl - Göran. Det fria skolvalet hotar kvaliteten Svensk skola. http://www.newsmill.se/artikel/2010/12/09/forskare-fria-skol...
About Sweden's plummeting PISA scores in reading:
PISA 2009 – Executive Summary, OECD 2010 page 15