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(Communicated by Dr. A. Narasinga Rao)
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Seetharaman, V. The geometry of partial differential equations of the second order. Proc. Indian Acad. Sci. 21, 211–217 (1945). https://doi.org/10.1007/BF03049854
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DOI: https://doi.org/10.1007/BF03049854