Geodesic
Functions with a Finite Number of Negative Squares
Canadian mathematical bulletin, Tome 15 (1972) no. 3, pp. 399-410

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Let f be a complex-valued function defined on the real line R with the property that for every x∊R. If k is a nonnegative integer,f is said to have k negative squares, or to be indefinite of order k, if the Hermitian form 
Stewart, James. Functions with a Finite Number of Negative Squares. Canadian mathematical bulletin, Tome 15 (1972) no. 3, pp. 399-410. doi: 10.4153/CMB-1972-073-9
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     author = {Stewart, James},
     title = {Functions with a {Finite} {Number} of {Negative} {Squares}},
     journal = {Canadian mathematical bulletin},
     pages = {399--410},
     year = {1972},
     volume = {15},
     number = {3},
     doi = {10.4153/CMB-1972-073-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-073-9/}
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