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@article{CMJ_1998__48_1_a4, author = {Junnila, H. J. K. and K\"unzi, H. P. A.}, title = {Characterizations of absolute $F_{\sigma\delta}$-sets}, journal = {Czechoslovak Mathematical Journal}, pages = {55--64}, publisher = {mathdoc}, volume = {48}, number = {1}, year = {1998}, mrnumber = {1614072}, zbl = {0926.54018}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMJ_1998__48_1_a4/} }
Junnila, H. J. K.; Künzi, H. P. A. Characterizations of absolute $F_{\sigma\delta}$-sets. Czechoslovak Mathematical Journal, Tome 48 (1998) no. 1, pp. 55-64. http://geodesic.mathdoc.fr/item/CMJ_1998__48_1_a4/