TY - RPRT TI - Objectively measured hyperactivity--II. Caffeine and amphetamine effects. AU - M D Schechter AU - G D Timmons DO - 10.1002/j.1552-4604.1985.tb02838.x UR - https://pubmed.ncbi.nlm.nih.gov/4008672/ ID - 4008672 ER -