scholarly journals A group-theoretic characterization of the ordinary and isotropic Euclidean planes.

1966 ◽  
Vol 7 (3) ◽  
pp. 209-238
Author(s):  
Sister Mary Justin Markham
2000 ◽  
Vol 74 (1) ◽  
pp. 1-5 ◽  
Author(s):  
A. Cossidente ◽  
G.L. Ebert ◽  
G. Korchmáros

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