1 Subjects: “...density threshold theory...”

2 Subjects: “...theory of mathematical modeling...”

3 Subjects: “...theory of planned behaviour...”

4 Subjects: “...Mathematical theory of computation / bicssc...”

5 Subjects: “...cultural distance theory...”

6 Subjects: “...collective action theory of logic...”

7 Subjects: “...game theory...”

8 Subjects: “...task-technology fit theory...”

9 Subjects: “...scheduling theory...”

10 Subjects: “...Z-number theory...”

11 Subjects: “...information gap decision theory (IGDT)...”

12 Subjects: “...game theory...”

13 Subjects: “...operator theory...”

14 Subjects: “...density functional theory...”

15 “... an appropriate and reliable decision support system. Fuzzy set theory, rough set theory, and neutrosophic set...”

16 “... in green manufacturing and logistics, including operations research, game theory, (meta)heuristics, machine...”

17 “..., open science, open education, and open innovation. The driving theory was that these types of open...”