I've never seen a good article with a definitive explanation - just speculation that the increased wetting forces due to nitrogen result in increased tombstones. My own experience is that nitrogen is a very minor contributor to tombstones and can pretty safely be ignored. Much more important are proper pad design (don't make the pads too long), print & placement accuracy (especially bad is print offset in one direction and placement in the other), and reflow profile (short profiles worse than longer ones).
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