Geodesic
Symmetrizable spaces and factor mappings
Matematičeskie zametki, Tome 14 (1973) no. 5, pp. 713-722

Voir la notice de l'article provenant de la source Math-Net.Ru

Main results: A pseudostratifiable symmetrizable space possesses a symmetric with weak Cauchy condition. A space is strongly symmetrizable if and only if it is a pseudo-open $\Pi$-image of a metric space. There exists a zero-dimensional symmetrizable space without a symmetric with weak Cauchy condition. 
@article{MZM_1973_14_5_a11,
     author = {Ya. A. Kofner},
     title = {Symmetrizable spaces and factor mappings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {713--722},
     publisher = {mathdoc},
     volume = {14},
     number = {5},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_14_5_a11/}
}
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Ya. A. Kofner. Symmetrizable spaces and factor mappings. Matematičeskie zametki, Tome 14 (1973) no. 5, pp. 713-722. http://geodesic.mathdoc.fr/item/MZM_1973_14_5_a11/