TY  - SER
AU  - Sallis, James F.
AU  - Berry, Charles C.
AU  - Broyles, Shelia L.
AU  - Mckenzie, Thomas L.
AU  - Nader, Philip R.
TI  - Variabiblity and tracking of physical activity over 2 yr in young children
PY  - 1995///
CY  - Estados Unidos
PB  - American College of Sport
ER  -