Helene E. Unland

发表

Paul R. Houser, William James Shuttleworth, W. J. Shuttleworth, 1996 .

Helene E. Unland, W. Ojeda, Pedroza Hector Quiñones, 1999 .

P. W. Scott, W. J. Shuttleworth, O. Sen, 1998 .