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by Helton; William S.
by Ball, Joseph A.; Bolotnikov, Vladimir; Helton, J. William; et al.
by Helton, Hilary
by Helton, Therese
by Rhodes, Karen Helton; Werner, Alexander H.
by Ball, Joseph A.; Curto, Raul E.; Grudsky, Sergei M.; et al.
by Helton, Kenneth
by Gohberg, I.; Helton, J. W.; Rodman, Leiba
by Helton, Debra