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Symbolic Comput.}, VOLUME = {46}, YEAR = {2011}, NUMBER = {6}, PAGES = {712--733} } @unpublished{Ren:CB, author = "Q.~Ren", title = "A formula for the {C}ayley--{B}acharach {T}heorem", year = "2011", note = "Preprint, {\sf http://math.berkeley.edu/~qingchun/}" } @unpublished{Reznick:PSDandSOS, author = "B.~Reznick", title = "On {H}ilbert's {C}onstruction of positive {P}olynomials", year = "2007", note = "Preprint, {\sf arXiv: 0707.2156}" } @incollection {Reznick:Survey, AUTHOR = {B.~Reznick}, TITLE = {Some concrete aspects of {H}ilbert's 17th {P}roblem}, BOOKTITLE = {Real algebraic geometry and ordered structures ({B}aton {R}ouge, {LA}, 1996)}, SERIES = {Contemp. Math.}, VOLUME = {253}, PAGES = {251--272}, PUBLISHER = {Amer. Math. Soc.}, ADDRESS = {Providence, RI}, YEAR = {2000} }