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Siberian Mathematical Journal > 2005 > 46 > 6 > 1135-1152
Annals of Global Analysis and Geometry > 2003 > 23 > 3 > 205-225
Annals of Global Analysis and Geometry > 2002 > 21 > 2 > 203-213
Applied Numerical Mathematics > 2001 > 37 > 1-2 > 257-269