MathSciNet bibliographic data MR1560310 Contributed Item Bell, E. T.; The equation \$ds\sp 2=dx\sp 2+dy\sp 2+dz\sp 2\$$ds\sp 2=dx\sp 2+dy\sp 2+dz\sp 2$. Bull. Amer. Math. Soc. 26 (1920), no. 7, 312–318. Article

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