Divorce: Real Estate ?

Hi there !

Situation:
Still married, but want to get divorced.

Besides my little business, I am also having a house together with my wife, fully paid, no mortgage.
I can't sell the house without my wifes permission, because we are both owning it and both of us are on the title.

So what can I do in order to proceed selling the house ?
She is not willing to do anything, she is not willing to sign an agreement.

So what can I do ?
Do I have to file a case on court ?
Or how do you do such a thing ?

Thank you for any little help, appreciate it !