Geodesic
A $\sigma$-porous set need not be $\sigma$-bilaterally porous
Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 4, pp. 697-703

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A closed subset of the real line which is right porous but is not $\sigma$-left-porous is constructed.
Classification : 26A03, 26A21, 26A99, 28A05, 28A55, 54H05
Keywords: sigma-porous; sigma-bilaterally-porous; right porous 
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     author = {N\'ajares, J. and Zaj{\'\i}\v{c}ek, L.},
     title = {A $\sigma$-porous set need not be $\sigma$-bilaterally porous},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {697--703},
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     zbl = {0822.26001},
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Nájares, J.; Zajíček, L. A $\sigma$-porous set need not be $\sigma$-bilaterally porous. Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 4, pp. 697-703. http://geodesic.mathdoc.fr/item/CMUC_1994__35_4_a10/