References
A. Speiser, Über die Minima Hermitescher Formen, Journ. f. d. reine u. angew. Math.167 (1932), S. 88–97.
O. Perron, Über das Minimum positiver Hermitescher Formen, Math. Zeitschr.36 (1932), S. 148–160. The reference to Speiser's paper is derived from Perron's.
A. Oppenheim, The lower bounds of indefinite Hermitian quadratic forms, Quarterly Journal of Mathematics, Oxford Series3 (1932), S. 10–14. The results of this paper hold forR(i). I have since obtained results for 538-1 for certain classes of values ofm.
A. Korkine and G. Zolotareff, Sur les formes quadratiques positives quaternaires, Math. Annalen5 (1872), S. 581–583.
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Oppenheim, A. The minima of positive definite Hermitian binary quadratic forms. Math Z 38, 538–545 (1934). https://doi.org/10.1007/BF01170653
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DOI: https://doi.org/10.1007/BF01170653