Existence of periodic solutions of semilinear parabolic equations and the method of upper and lower solutions
1983 ◽
Vol 97
(1)
◽
pp. 291-299
◽
2009 ◽
Vol 46
(4)
◽
pp. 691-699
◽
1996 ◽
pp. 291-298
◽
2007 ◽
Vol 46
(5)
◽
pp. 1754-1778
◽
1997 ◽
Vol 22
(9-10)
◽
pp. 1529-1557
◽
2009 ◽
Vol 80
(4)
◽
pp. 808-813
◽