TY - RPRT TI - A structured visual language for a knowledge-based front-end to statistical analysis systems in biomedical research. AU - K M Wittkowski PY - 1991 DO - 10.1016/0169-2607(91)90105-3 UR - https://pubmed.ncbi.nlm.nih.gov/1879137/ ID - 1879137 ER -