Geodesic
On Necessity of Argument while Solving Stereometric Problems
Matematičeskoe obrazovanie, no. 4 (2009), pp. 11-18 Cet article a éte moissonné depuis la source Math-Net.Ru

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Argument is still necessary if some stereometric fact seems to be "intuitively clear" or "evident". This is illustrated by numerous examples. 
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     author = {E. Potoskuev},
     title = {On {Necessity} of {Argument} while {Solving} {Stereometric} {Problems}},
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     url = {http://geodesic.mathdoc.fr/item/MO_2009_4_a1/}
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E. Potoskuev. On Necessity of Argument while Solving Stereometric Problems. Matematičeskoe obrazovanie, no. 4 (2009), pp. 11-18. http://geodesic.mathdoc.fr/item/MO_2009_4_a1/