Periodic solutions in systems of piecewise- linear differential equations
1995 ◽
Vol 10
(2)
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pp. 179-193
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2007 ◽
Vol 22
(3)
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pp. 1603-1612
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1991 ◽
Vol 7
(4)
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pp. 354-359
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1951 ◽
Vol s1-26
(3)
◽
pp. 215-221
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1968 ◽
Vol 27
(5)
◽
pp. 365-372
◽
1959 ◽
Vol 38
(1-4)
◽
pp. 126-129
◽
1997 ◽
Vol 55
(2)
◽
pp. 177-184
◽
1986 ◽
Vol 14
(4)
◽
pp. 305-314
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