TY JOUR TI RESEARCH OF STRUCTURE MODIFIED KARBAMIDOFORMALDEGIDNYH PITCHES A NUCLEAR MAGNETIC RESONANCE-SPECTROSCOPY METHOD KW toxicity KW pitch KW naftoly KW connections with the condensed benzene kerne/s JO Bulletin of KSAU AU Plotnikov, N.P. AU Simikova, A.A. AU Plotnikova, G.P. PY 2012 IS PB Krasnoyarsk State Agrarian University