METHOD FOR CONCENTRATING AND CLEANING OF USED-UP SULFURIC ACID OF ORGANIC IMPURITIES von LARIN VALERIJ K,SU, FAJN SOLOMON I,SU, KUZNETSOV VALERIJ L,SU, NESTEROV YURIJ V,SU, GREBNEV GENNADIJ S,SU, MIKHAJLOV VIKTOR B,SU, ANDRIANOV BORIS P,SU, DENISENKO ALEKSANDR P,SU, SBITNEV ALEKSEJ M,SU, SOLOVEV SERGEJ A,SU, ISENGILDINA IRINA P,SU

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