TY  - RPRT
TI  - Nonlinear techniques for forecasting solar activity directly from its time series
AU  - Ashrafi, S.
AU  - Roszman, L.
AU  - Cooley, J.
PY  - 1993
UR  - https://ntrs.nasa.gov/citations/19930015527
ID  - 19930015527
ER  -