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JOURNAL OF DIFFERENTIAL EQUATIONS, vol. 173, no. 2, page. 321 - 355, 2001-07-01

JOURNAL OF DIFFERENTIAL EQUATIONS, vol. 163, no. 2, page. 429 - 474, 2000-05-20

JOURNAL OF DIFFERENTIAL EQUATIONS, vol. 244, no. 10, page. 2473 - 2497, 2008-05-15

JOURNAL OF DIFFERENTIAL EQUATIONS, vol. 216, no. 1, page. 78 - 108, 2005-09-01

JOURNAL OF DIFFERENTIAL EQUATIONS, vol. 217, no. 2, page. 257 - 281, 2005-10-15