 Complete the following phrase:  In 1996 he invited the representatives of big business among them Boris Berezovsky, Mikhail Khodorkovsky, Vladimir Gusinsky, Mikhail Fridman and others to unite and embark on a constructive public attitude. The result was the famous Letter from thirteen which led to the creation of the so-called Semibankirschina  a closed group of oligarchs who owned over 50 of all Russian resources, the majority of Russian mass media, and who promoted Boris Yeltsin during the 