TY  - RPRT
TI  - Experimental functional analyses for challenging behavior: a study of validity and reliability.
AU  - N T Martin
AU  - E A Gaffan
AU  - T Williams
DO  - 10.1016/s0891-4222(98)00037-7
UR  - https://pubmed.ncbi.nlm.nih.gov/10198943/
ID  - 10198943
ER  -