TY - RPRT TI - Methylphenidate and cognitive perseveration in hyperactive children. AU - R Tannock AU - R Schachar PY - 1992 DO - 10.1111/j.1469-7610.1992.tb00940.x UR - https://pubmed.ncbi.nlm.nih.gov/1400703/ ID - 1400703 ER -