1. Primes is in P;Agrawal;Ann. Math.,2004
2. On the number of limit cycles which appear with the variation of coefficients from an equilibrium position of focus or center type;Bautin;Mat. Sb.,1952
3. On the number of limit cycles which appear with the variation of coefficients from an equilibrium position of focus or center type;Bautin;Amer. Math. Soc. Transl.,1954
4. The number of limit cycles of certain polynomial differential equations;Blows;Proc. Roy. Soc. Edinburgh Sect. A,1984
5. Integrability of a linear center perturbed by fourth degree homogeneous polynomial;Chavarriga;Publ. Mat.,1996