LONDON  - World oil prices rebounded slightly Tuesday on encouraging Chinese data after tumbling the previous day on demand concerns linked to the worsening eurozone sovereign debt crisis, analysts said. Brent North Sea crude for delivery in September added 28 cents to $103.54 a barrel in London midday deals. New York's main contract, light sweet crude for September, put on 17 cents to $88.31. Prices plunged by more than $3.50 on Monday as eurozone debt strains, centred on Spain, spelled weaker demand for the commodity.