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- Centers of cubic differential systems with the multiple line at infinity.
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Şubă A. Bul. Ştiinţific. Univ. Baia Mare (România), Ser. B, Matematică-Informatică. Vol. XVIII(2002), nr.2, 355-360. - Centers of some cubic systems.
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- Mathematical Society of the Republic of Moldova.
- Romanian Society of Applied and Industrial Mathematics.
- American Mathematical Society.
- Reviewer in the journal "Mathematical Reviews " of the American Mathematical Society.
- Reviewer in the journal "Buletinul Academiei de Stiinte a Moldovei. Matematica".
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