Oldham
Journal of the Chemical Society, 1950 , p. 100,105
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Barnes; Prochaska
Journal of the American Chemical Society, 1950 , vol. 72, p. 3188,3190
in water
NaOH added successively to a soln. of Ag-salt and o-nitrobenzoic acid until pH 5; precipitate redissolved in hot water, slowly evapd. in the dark at roomtemp.;