The Petrograd formula was a Peace Formula constructed by the Bolshevik party after their Revolution in November 1917. The Bolsheviks did not want Russia to participate in the first World War. After the interception of the Miliukov note, the Petrograd Soviet issued the Petrograd Formula in May declaring "peace without annexations or indemnities, on the basis of the self-determination of peoples".
The original article can be found at Petrograd formula and the edit history here.