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by Vitha, Mark F.
by Wang, Perry G.; Vitha, Mark F.; Kay, Jack F.
by Fan, Z. Hugh; Vitha, Mark F.
by Olsen, Bernard A.; Pack, Brian W.; Vitha, Mark F.
by Conklin, Alfred R.; Vitha, Mark F.
by Frank A. Settle (Washington and Lee University, Lexington, VA, USA ); Brian D. Lamp (Truman State University Kirksville, MO, USA ); David L. McCurdy (Truman State University, Kirksville, MO, USA ); et al.