**TOME 62 (110), no. 2, 2019****Claudia Andrei-Ciobanu:**Kruskal-Katona theorem for -spread strongly stable ideals, 107-122**Sheng Bau:**Separating polygons in quadrangulations of the sphere, 123-131**Mou-Jie Deng, Jin Guo:**Application of quartic residue character theory to the Diophantine equation , 133-139**Jürgen Herzog, Somayeh Moradi, Masoomeh Rahimbeigi, Ali Soleyman Jahan:**On the monomial reduction number of a monomial ideal in , 141-162**Prasanna Kumar:**On Zygmund-type inequalities involving polar derivative

of a lacunary-type polynomial , 163-172**Teng Cheng:**Primitive prime divisors for weighted homogeneous polynomial, 173-182**Zoran Stanic:**Some bounds for the largest eigenvalue of a signed graph, 183-189**Zhang Wenpeng, Chen Zhuoy:**A hybrid power mean of the two-term exponential sums and the reciprocal of the quartic Gauss sums , 191-198**Yiwei Ye:**Ground state solutions for nonautonomous Schrödinger-Poisson systems involving critical exponent, 199-207**Bin Zhang:**A remark on bounds for the maximal height of divisors of , 209-214