Some equivalent formulation of Ulam's problem
Raman, P. K.
General Topology and Its Relations to Modern Analysis and Algebra, GDML_Books, (1971), p. [235]-236 / Harvested from
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@article{700558,
     title = {Some equivalent formulation of Ulam's problem},
     booktitle = {General Topology and Its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1971},
     pages = {[235]-236},
     zbl = {0225.54014},
     url = {http://dml.mathdoc.fr/item/700558}
}

Raman, P. K. Some equivalent formulation of Ulam's problem, dans General Topology and Its Relations to Modern Analysis and Algebra, GDML_Books,  (1971), pp. [235]-236. http://gdmltest.u-ga.fr/item/700558/