Sharma, B. D. (1999). Differential equations. Kedar Nath Ram Nath.
Lua i Stíl Chicago (17ú heag.)Sharma, Bhu Dev. Differential Equations. New Delhi: Kedar Nath Ram Nath, 1999.
Lua MLA (8ú heag.)Sharma, Bhu Dev. Differential Equations. Kedar Nath Ram Nath, 1999.
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