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by Weigold, Michael F; Arens, William F
by Arens, William; Weigold, Michael
by Michael Weigold; William Arens
by Arens, William; Arens, Christian; Weigold, Michael; et al.
by Arens, William; Weigold, Michael; Arens, Christian
by Arens, William; Schaefer, David; Weigold, Michael
by William Arens; Michael Weigold
by Arens, William; Weigold, Michael; Schaefer, David; et al.
by Arens, William; Arens, Christian; Weigold, Michael