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Mathematical Methods in the Applied Sciences > 46 > 14 > 15458 - 15480
Mathematical Methods in the Applied Sciences > 37 > 9 > 1333 - 1352
Mathematische Nachrichten > 285 > 14‐15 > 1860 - 1879
Applied Mathematics and Mechanics > 2007 > 28 > 4 > 511-520
Computers and Mathematics with Applications > 2004 > 47 > 6-7 > 863-875
Mathematical Notes > 2001 > 70 > 3-4 > 392-402