On fuzzy bitopological spaces. - Ali Kandil; A. A. Nouh; Sobhy A. El-Sheikh (Fuzzy Sets Syst., 1995)

Strong and ultra separation axioms of fuzzy bitopological spaces. - Ali Kandil; A. A. Nouh; Sobhy A. El-Sheikh (Fuzzy Sets Syst., 1999)

Compactness in fuzzy (fuzzy supra) topological spaces. - Sobhy A. El-Sheikh (Fuzzy Sets Syst., 2000)

A new approach to fuzzy bitopological spaces. - Sobhy A. El-Sheikh (Inf. Sci., 2001)

Covering-based rough fuzzy sets and binary relation. - A. M. Kozae; Sobhy A. El-Sheikh; R. Mareay (J. Intell. Fuzzy Syst., 2014)

A note on "separation axioms in fuzzy bitopological spaces". - Osama A. E. Tantawy; Sobhy A. El-Sheikh; Rasha Naser Majeed (J. Intell. Fuzzy Syst., 2015)

Generalized rough multiset via multiset ideals. - Amr Zakaria; Sunil Jacob John; Sobhy A. El-Sheikh (J. Intell. Fuzzy Syst., 2016)

Comment on "Rough Multisets and Information Multisystems". - Sobhy A. El-Sheikh; Mona Hosny; Mahmoud Raafat (Adv. Decis. Sci., 2017)

Some types of pairwise soft sets and the associated soft topologies. - Ali Kandil; Osama A. E. Tantawy; Sobhy A. El-Sheikh; Shawqi A. Hazza (J. Intell. Fuzzy Syst., 2017)

Mappings and Connectedness on Hesitant Fuzzy Soft Multispaces. - Ali Kandil; Sobhy A. El-Sheikh; Mona Hosny; Mahmoud Raafat (Adv. Fuzzy Syst., 2020)

Hesitant fuzzy soft multisets and their applications in decision-making problems. - Ali Kandil; Sobhy A. El-Sheikh; Mona Hosny; Mahmoud Raafat (Soft Comput., 2020)

Bi-ideal approximation spaces and their applications. - Ali Kandil; Sobhy A. El-Sheikh; Mona Hosny; Mahmoud Raafat (Soft Comput., 2020)

Increasing and Decreasing Soft Rough Set Approximations. - Sobhy Ahmed Ali El-Sheikh; Shehab El-deen Ali Kandil; Salama Hussien Ali Shalil (Int. J. Fuzzy Log. Intell. Syst., 2023)