This one is definitely worth reading (unfortunately, the article is in Polish only).
More unfortunately, the text on Wyborcza is subscriber only. Does anybody happen to know of a site which has a version of the article which is free to all?
We may look at it in this way: this was to the advantage of the Kremlin as communist order was restored in Warsaw without loosing a single drop of Russian blood and spending a single rouble on it. General Jaruzelski was much celebrated thereafter in Moscow ...
The only reason they would celebrate that would be if they thought that without him they would have needed to spill Russian blood and spend lots of roubles, which would mean that they did plan to invade if the General hadn't acted. Not that that that is news.
There is a long (102 pages, plus 30 pages of intro and documents) but absolutely brilliant article titled "Jaruzelski, the Soviet Union, and the Imposition of Martial Law in Poland: New Light on the Mystery of December 1981" here: wilsoncenter.org/sites/default/files/CWIHPBulletin11_p1.pdf
I haven't finished it yet but so far it is superb.
A more important question for me is: To whose advantage had the martial law been declared?
Frankly it was in almost everybody's (short-term) interests; without it the death toll would probably have stretched into the tens of thousands.
I do believe written word but not ones written by IPN. Most of the historians were proven to be at least selective in their work.
That's not true. Almost all of the IPN stuff about WWII events and events shortly after the war is top notch. The problem comes with their more contemporary work (e.g. the fact that according to their files nobody in the secret police ever even wondered if Jarek Kaczynski might be gay).