%0 Journal Article
%A Dumir, V. C.
%A Hans-Gill, R. J.
%A Wilker, J. B.
%T Contributions to a General Theory of View-Obstruction Problems
%J Canadian journal of mathematics
%D 1993
%P 517-536
%V 45
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1993-027-9/
%R 10.4153/CJM-1993-027-9
%F 10_4153_CJM_1993_027_9