TY JOUR TI Application of natural zeolite in oil-well cement composition KW oil-well cement KW mineral additives KW zeolite KW clinoptilolite KW cement stone KW strength KW slurry JO Technique and technology of silicates AU Guvalov, A.A. AU Abbasova, S.I. AU Kouznetsova, T.V. PY 2018 IS 25 PB Individual Entrepreneur Svetlana Vasilievna Samchenko