TY - RPRT TI - Observations on changes in ultrasonically treated waste-activated sludge. AU - C P Chu AU - B V Chang AU - G S Liao AU - D S Jean AU - D J Lee PY - 2001 DO - 10.1016/s0043-1354(00)00338-9 UR - https://pubmed.ncbi.nlm.nih.gov/11235869/ ID - 11235869 ER -