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A recent paper and a preprint both claim records for the lowest carrierconcentration at which superconductivity has been observed. However colleaguesin Australia and I found evidence for superconductivity at concentrations ofthe order of at least a hundred times lower in the 1980's, in a ceramic sampleof SrTiO_3 with 3% of Ti replaced by Zr.

Comment on two papers claiming records for the lowest carrier concentration at which superconductivity has been observed