On oscillation, continuation, and asymptotic expansions of solutions of linear differential equations
Rendiconti del Seminario Matematico della Università di Padova, Tome 85 (1991), pp. 1-25. 
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     author = {Bank, Steven B.},
     title = {On oscillation, continuation, and asymptotic expansions of solutions of linear differential equations},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--25},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {85},
     year = {1991},
     mrnumber = {1142530},
     zbl = {0743.34012},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1991__85__1_0/}
}
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Bank, Steven B. On oscillation, continuation, and asymptotic expansions of solutions of linear differential equations. Rendiconti del Seminario Matematico della Università di Padova, Tome 85 (1991), pp. 1-25. http://www.numdam.org/item/RSMUP_1991__85__1_0/

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