 Complete the following phrase:  On March 17, 1991, the all-Russian referendum on the introduction of the post of President of Russia was held. More than 70 of citizens voted for the introduction of the post of President, elected by direct vote. On 12 June 1991, Boris Yeltsin won 57 of the popular vote in the presidential election. Yeltsins inauguration took place on 10 July, with the 