A simplified proof of the expansion theorem for singular second order linear differential equations
Levinson, Norman
Duke Math. J., Tome 18 (1951) no. 1, p. 57-71 / Harvested from Project Euclid
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Publié le : 1951-03-14
Classification:  36.0X 
@article{1077476389,
     author = {Levinson, Norman},
     title = {A simplified proof of the expansion theorem for singular
 second order linear differential equations},
     journal = {Duke Math. J.},
     volume = {18},
     number = {1},
     year = {1951},
     pages = { 57-71},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1077476389}
}

Levinson, Norman. A simplified proof of the expansion theorem for singular
 second order linear differential equations. Duke Math. J., Tome 18 (1951) no. 1, pp.  57-71. http://gdmltest.u-ga.fr/item/1077476389/