Geodesic
Note on an Application of the δ-Function in the Representation of Solutions of Algebraic Equations
Canadian mathematical bulletin, Tome 10 (1967) no. 5, pp. 735-738

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The “function” δ(x - xo) is known as the Dirac Delta function and may be defined as zero everywhere except at xo, where it is infinite in such a way that 1 having property that for every continuous function φ(x) on (a, b) 2 It is well known [2] δ(x-xo) can be approximated as a limit of a sequence of piecewise continuous functions, and there is an abundance of such sequences. 
Sabat, J. B. Note on an Application of the δ-Function in the Representation of Solutions of Algebraic Equations. Canadian mathematical bulletin, Tome 10 (1967) no. 5, pp. 735-738. doi: 10.4153/CMB-1967-076-3
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     author = {Sabat, J. B.},
     title = {Note on an {Application} of the {\ensuremath{\delta}-Function} in the {Representation} of {Solutions} of {Algebraic} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {735--738},
     year = {1967},
     volume = {10},
     number = {5},
     doi = {10.4153/CMB-1967-076-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-076-3/}
}
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