Russian card game preferans/preferance?

[Stoli7]

Just saw on TV a group playing Russian card game preferans/preferance. This game looks complicated. Anyone knows where I can find rules to this game? As I understand it's often played for money. How does the betting work?

[Sightless]

I used to play this game in russia when I was a lot younger but i forgot most of the rules.
some links
http://www.netintellgames.com/preferencerules.htm
http://web.archive.org/web/20021208174428/http://www.mashke.org/Pref/
http://pagat.com/rams/ruspref.html