TY - RPRT TI - Evaluating the effect of co-contraction in optimization models. AU - R E Hughes AU - J C Bean AU - D B Chaffin PY - 1995 DO - 10.1016/0021-9290(95)95277-c UR - https://pubmed.ncbi.nlm.nih.gov/7657686/ ID - 7657686 ER -