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# 2018, f. 2, tomul LXIV

- Ghouti Djellouli, Abdelhalim Azzouz, Bekkai Messirdi:
*Essential spectra and Drazin invertibility of quasisimilar closed operators*, p. 215 - Absos Ali Shaikh, Indranil Roy, Haradhan Kundu:
*On the existence of a generalized class of recurrent manifold*s, p. 227 - Bendjeddou Ahmed, Berbache Aziza, Cheurfa Rachid:
*Exact algebraic and non-algebraic limit cycles for a class of integrable quintic and planar polynomial differential systems*, p. 247 - Neda Ebrahimi, Tayebe Waezizadeh:
*Universal covering space of top space*s, p. 255 - Mohammad Ashraf, Sajad Ahmad Pary, Mohd Arif Raza:
*On differential identities involving commutator and anti-commutator in prime and semiprime rings*, p. 267 - Ömür Deveci, Metin Avcı, Erdal Karaduman:
*The periods of the k-step Fibonacci and k-step Pell sequences in \(D_{2n}\times{\mathbb{Z}}_{2^i}\) and \(D_{2n}\times_{\varphi} {\mathbb{Z}}_{2^i}\),* p. 277 - Kuldip Raj, Charu Sharma:
*Applications of four dimensional matrices to generating some roughly I*_{2}-convergent double sequence spaces, p. 287 - Ardavan Najafi, Esfandiar Eslami, Arsham Borumand Saeid:
*A new type of nilpotent BCI-algebras*, p. 303 - Stephan Klaus:
*On different notions of higher curvature*, p. 321 - Atsushi Fujioka, Hitoshi Furuhata:
*The center map of a centroaffine ruled surface*, p. 337 - Bijan Kumar Patel, Takao Komatsu, Prasanta Kumar Ray:
*Higher-order identities for the second-order sequence*, p. 351 - Mircea Cimpoeaş:
*On the Stanley depth of a special class of Borel type ideals*, p. 363 - Paula Catarino, Paulo Vasco:
*On matrices with the Pell, Pell-Lucas, k-Pell and k-Pell-Lucas quaternions*, p. 367 - Pulak Sahoo, Himadri Karmakar:
*Uniqueness results related to certain q-shift difference polynomials*, p. 383 - I. Pop:
*Directed weak and directed Dold fibrations*, p. 399 - Firdous A. Shah, Shallu Sharma, M. Younus Bhat:
*Wavelet frame characterization of Lebesgue spaces on local fields*, p. 423