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Singh P, Joshi SD, Patney RK, Saha K.Singh P, et al. Among authors: joshi sd.Proc Math Phys Eng Sci. 2017 Mar;473(2199):20160871. doi: 10.1098/rspa.2016.0871. Epub 2017 Mar 15.Proc Math Phys Eng Sci. 2017.PMID: 28413352Free PMC article.