共 50 条
- [1] RINGS WITH SUM OF SQUARES PROPERTIES - PRELIMINARY REPORT NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1975, 22 (06): : A660 - A660
- [5] Representation of positive semidefinite elements as sum of squares in 2-dimensional local rings Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas, 2022, 116