| | Cluster | Papers | Research areas |
| | 1 | [14, 37, 43, 78, 93, 111, 112] | Engineering | | 2 | [39, 148] | Engineering, psychology | | 3 | [42, 58, 137] | Environmental science and ecology, engineering, business and economics | | 4 | [5, 46, 61, 62, 88] | Engineering, operation research and management, computer science | | 5 | [47, 92] | Environmental science and ecology | | 6 | [50, 99, 136] | Environmental science and ecology, computer science, business and economics | | 7 | [53, 117] | Environmental science and ecology | | 8 | [63, 104] | Environmental science and ecology, engineering, computer science | | 9 | [35, 59, 66, 79, 113] | Environmental science and ecology, engineering, operation research and management, computer science | | 10 | [67, 107] | Engineering, operation research and management | | 11 | [98, 175] | Environmental science and ecology, engineering | | 12 | [38, 52, 121, 152, 157] | Engineering, operation research and management, psychology | | 13 | All the other papers | Environmental science and ecology, engineering, computer science, business and economics |
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