Dai, Z. D.; Lam, T. Y.; Milgram, R. J. Application of topology to problems on sums of squares. (English) Zbl 0488.10019 Enseign. Math., II. Sér. 27, 277-283 (1981). MSC: 11E16 13A99 55N15 11P05 55Q50 × Cite Format Result Cite Review PDF
Dai, Z. D.; Lam, T. Y.; Peng, C. K. Levels in algebra and topology. (English) Zbl 0435.10016 Bull. Am. Math. Soc., New Ser. 3, 845-848 (1980). MSC: 11E16 13B25 13F20 13G05 55M10 55P99 × Cite Format Result Cite Review PDF Full Text: DOI