Bibliography
Jacobson, N.: Lectures in abstract algebra III. Princeton: van Nostrand 1964.
Trèves, F.: Linear partial differential equations with constant coefficients. New York: Gordon & Breach 1966.
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This research was supported in part by NSF GP-6959.
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Quillen, D.G. On the representation of hermitian forms as sums of squares. Invent Math 5, 237–242 (1968). https://doi.org/10.1007/BF01389773
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DOI: https://doi.org/10.1007/BF01389773