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5. Tekhnicheskie ukazaniya po opredeleniyu i ispol’zovaniyu kharakteristik ustroistva i sostoyaniya puti, poluchaemykh vagonami-puteobsledovatel’skimi stanziyami TsNII-4 (TsPT-55/15) (Technical Instructions on Determination and Use of Railway Track Structure and Condition Parameters Obtained by Railway Inspection Cars TsNII-4. (TsPT-55/15)): Department of railways and constructions, Russian Ministry of Railways, Moscow, 2003.