On determining the rise, size, and duration classes of a sunspot cycle [microform] / Robert M. Wilson, David H. Hathaway, and Edwin J. Reichmann (NASA technical paper ; 3652)
On determining the rise, size, and duration classes of a sunspot cycle [microform] / Robert M. Wilson, David H. Hathaway, and Edwin J. Reichmann
原資料の出版事項: Marshall Space Flight Center, Ala. ; [Springfield, Va. : National Aeronautics and Space Administration : National Technical Information Service, distributor, 1996]