TY - RPRT TI - Gradient chromatofocusing high-performance liquid chromatography. I. Practical aspects. AU - Y Liu AU - D J Anderson PY - 1997 DO - 10.1016/s0021-9673(96)00854-0 UR - https://pubmed.ncbi.nlm.nih.gov/9098979/ ID - 9098979 ER -