MR1189894
Steinbart, Enid M.
Enid M. STEINBART
On the location of zeros of solutions to {$w''+Aw=0$}
Funkcialaj Ekvacioj. Serio Internacia
35
1992
223--254
http://fe.math.kobe-u.ac.jp/FE/Free/vol35/fe35-2-2.pdf
http://fe.math.kobe-u.ac.jp/FE/FE_pdf_with_bookmark/FE35-40-en_KML/fe35-223-254/fe35-223-254.pdf
http://www.ams.org/mathscinet-getitem?mr=MR1189894
fe35-223-254
1992
On the Location of Zeros of Solutions to $w''+Aw=0$
STEINBART, Enid M.
STEINBART, Enid M.
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