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mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.25 (1878)
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.32 (1884-1885)
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.27 (1880)
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mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.20 (1873)
mémoires de l'académie impériale des sciences de st.-pétersbourg. 7e série. ser.7:t.33 (1885-1886)
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