In the past T.M. Birshtein has collaborated on articles with Ju.V. Lyatskaya and N.P. Borisova. One of their most recent publications is Flexibility of aromatic polyimides and polyamidoacids. Which was published in journal European Polymer Journal.
More information about T.M. Birshtein research including statistics on their citations can be found on their Copernicus Academic profile page.