by Peter Nijkamp | .
by J Davidson | R Lloyd.
by Ingo Walter | Kaj Areskong.
by I Arnon | .
by C C Bishop | W D Toussaint.
by C E Bishop | W D Toussaint.
by Gail L Cramer | Clarence W Jensen.
by Robert C Oelhaf | .
by Margeret R Biswas | Asit K Biswas.
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