During the time in Leiden Nordström solved Einstein's field equations outside a spherically symmetric charged body. The solution was also found by Hans Reissner, Hermann Weyl and George Barker Jeffery, and it is nowadays known as the Reissner–Nordström metric. Nordström maintained frequent contact with many of the other great physicists of the era, including Niels Bohr and Albert Einstein. For example, it was Bohr's contributions that helped Nordström to circumvent the Russian censorship of German post to Finland, Finland was at the time a grand duchy of the Russian empire.