arXiv · hep-ph/0411031
The present status of the problem of identifying the sign of $Δm_{12}^2$ is discussed in view of the development of new methods of detection of solar neutrinos.
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Anatoly Kopylov. 2004-11-05. About the sign of $Δm_{12}^2$. https://arxiv.org/abs/hep-ph/0411031
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