Continous, piecewise-polynomial functions which solve Hilbert's 17th problem.
1993 ◽
Vol 1993
(440)
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pp. 157-174
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Keyword(s):
1992 ◽
Vol 44
(6)
◽
pp. 1262-1271
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1971 ◽
Vol 17
(4)
◽
pp. 351-367
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Keyword(s):
1973 ◽
Vol C-22
(11)
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pp. 970-975
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2013 ◽
Vol 22
(2)
◽
pp. 253-268
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