TY JOUR TI Possibilities of spectral analysis methods for the oil sludge research KW cake KW tricanter KW oily waste KW X-ray fluorescence spectrometry KW spectral analysis JO From Chemistry Towards Technology Step-By-Step AU Nikitina, E.L. AU Smirnova, V.A. AU Danilova, A.S. PY 2024 IS 5 PB Yaroslavl State Technical University