Link: http://www.eni.ch/featured/article.php?id=2816

And note my emphasis:

The Reformed foundation is a group of members of the Political Reformed Party (SGP), who judge the SGP to be insufficiently Calvinist. Founded in 1918, the SGP is the oldest political party in the Netherlands, and is known for its refusal to take part in any government Cabinet.

I wrote up on the SGP, briefly, during my diaries for the general elections:

SGP (Political Reformed Party)
The Dutch Christian Fundies.  They are the oldest political party, have never been in the government and for as long as I remember are stuck with two to three seats in parliament. Perhaps they could have twice as many seats, if the party wasn't constantly proclaiming that women have no role in politics and shouldn't be entitled to vote. Most of their adherents come forth from the Dutch Bible Belt. At the county-level, SGP often joins forces with the ChristenUnie, but in this election the ChristenUnie has refused to go together. This may have something to do with the fact that many find the SGP simply too extreme. Hopefully by 2050 the party will finally collapse under the influence of inbreeding and sheer stupidity.