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- ACS Style
- Козьма, Д. Центри в кубічних диференціальних системах з однорідними інваріантними прямими. Буковинський математичний журнал. 2016, 1
- AMA Style
- Козьма Д. Центри в кубічних диференціальних системах з однорідними інваріантними прямими. Буковинський математичний журнал. 2016; 1(3-4).
- Chicago/Turabian Style
- Думітру Козьма. 2016. "Центри в кубічних диференціальних системах з однорідними інваріантними прямими". Буковинський математичний журнал. 1 вип. 3-4.