Assessment of integrated index of environmental units of the transport system Gennady I. Shulga, Alex O. Kolesnichenko, Eugene V. Skrynnikov, Tatiana G. Shulga and Maxim A. Vasilyev MATEC Web Conf., 226 (2018) 01027 Published online: 07 November 2018 DOI: 10.1051/matecconf/201822601027