EP499502-A1  JOURNAL OF THE WATER POLLUTION CONTROL FEDERATION. vol. 59, no. 3, Mars 1987, WASHINGTON US pages 152 - 161; HARPER, STEPHEN R. ET AL.: 'ENHANCEMENT OF ANAEROBIC TREATMENT EFFICIENCY THROUGH PROCESS MODIFICATION';  PATENT ABSTRACTS OF JAPAN vol. 6, no. 208 (C-130)(1086) 20 Octobre 1982 & JP-A-57 113 899 ( FUJI DENKI SEIZO K.K. ) 15 Juillet 1982;  WATER RESEARCH. vol. 24, no. 1, Janvier 1990, OXFORD GB pages 121 - 123; W.R.SLATER ET AL.: 'A MICROCOMPUTER-BASED INSTRUMENTATION SYSTEM ETC.';  PATENT ABSTRACTS OF JAPAN vol. 6, no. 208 (C-130)(1086) 20 Octobre 1982&JP-A-57 113 899 ( FUJI DENKI SEIZO K.K. ) 15 Juillet 1982;  SLATER ET AL.: 'A MICROCOMPUTER-BASED INSTRUMENTATION SYSTEM ETC.'US5248423-A  "Enhancement of Anaerobic Treatment Efficiency Through Process Modification," S. R. Harper; Journal WPCF, vol. 59, No. 3, pp. 152-161, Mar. 1987.;  Patent Abstracts of Japan, vol. 6, No. 208 (C-130)(1086) Oct. 20, 1982 and JP-A-57-113-899 (Fuji Denki Seizo K.K.) Jul. 15, 1982.;  W. R. Slater, "A Microcomputer-based Instrumentation System for anaerobic Wastewater Treatment Processes," Water Research, vol. 24, No. 1, Jan. 1990, Oxford GB, pp. 121-123.EP499502-B1  JOURNAL OF THE WATER POLLUTION CONTROL FEDERATION. vol. 59, no. 3, Mars 1987, WASHINGTON US pages 152 - 161; HARPER, STEPHEN R. ET AL.: 'ENHANCEMENT OFANAEROBIC TREATMENT EFFICIENCY THROUGH PROCESS MODIFICATION';  PATENT ABSTRACTS OF JAPAN vol. 6, no. 208 (C-130)(1086) 20 Octobre 1982;  WATER RESEARCH. vol. 24, no. 1, Janvier 1990, OXFORD GB pages 121 - 123; W.R. SLATER ET AL.: 'A MICROCOMPUTER-BASED INSTRUMENTATION SYSTEM ETC.'FR2672583-A1  JOURNAL OF THE WATER POLLUTION CONTROL FEDERATION. vol. 59, no. 3, Mars 1987, WASHINGTON US pages 152 - 161; HARPER, STEPHEN R. ET AL.: 'ENHANCEMENT OF ANAEROBIC TREATMENT EFFICIENCY THROUGH PROCESS MODIFICATION';  PATENT ABSTRACTS OF JAPAN vol. 6, no. 208 (C-130)(1086) 20 Octobre 1982 & JP-A-57 113 899 ( FUJI DENKI SEIZO K.K. ) 15 Juillet 1982;  WATER RESEARCH. vol. 24, no. 1, Janvier 1990, OXFORD GB pages 121 - 123; W.R.SLATER ET AL.: 'A MICROCOMPUTER-BASED INSTRUMENTATION SYSTEM ETC.'