Über Systeme reeller algebraischer Gleichungen
Compositio Mathematica, Tome 7 (1940), pp. 1-19. 
@article{CM_1940__7__1_0,
     author = {Behrend, Felix},
     title = {\"Uber {Systeme} reeller algebraischer {Gleichungen}},
     journal = {Compositio Mathematica},
     pages = {1--19},
     publisher = {Johnson Reprint Corporation},
     volume = {7},
     year = {1940},
     zbl = {0021.29301},
     language = {de},
     url = {http://archive.numdam.org/item/CM_1940__7__1_0/}
}
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Behrend, Felix. Über Systeme reeller algebraischer Gleichungen. Compositio Mathematica, Tome 7 (1940), pp. 1-19. http://archive.numdam.org/item/CM_1940__7__1_0/