Column chart. Data table with 13 rows and 8 columns follows.
| 2566 | 2565 | 2564 | 2563 | 2562 | 2561 | 2560 | |
|---|---|---|---|---|---|---|---|
| ACM | 3,063 | 5,216 | 4,851 | 13,886 | 3,511 | 3,540 | 3,978 |
| IEL | 0 | 103,176 | 40,782 | 81,771 | 161,084 | 175,829 | 157,443 |
| PQDT | 0 | 0 | 3,357 | 5,113 | 13,135 | 21,650 | 38,561 |
| SpringerLink | 22,235 | 33,633 | 14,920 | 45,721 | 33,231 | 45,133 | 40,988 |
| ISI Web of Science | 0 | 0 | 4,268 | 3,153 | 18,862 | 2,087 | 25,544 |
| ACS | 13,770 | 11,941 | 7,755 | 28,432 | 24,366 | 15,877 | 11,261 |
| Academic Search Complete | 0 | 13,219 | 5,124 | 36,901 | 33,577 | 67,929 | 353,268 |
| Emerald | 0 | 3,190 | 2,254 | 2,595 | 3,063 | 7,015 | 9,382 |
| ScienceDirect | 0 | 198,759 | 77,754 | 117,246 | 254,040 | 370,237 | 373,306 |
| IEEE | 35,529 | 0 | 0 | 0 | 0 | 0 | 0 |
| Scifinder | 22,235 | 0 | 0 | 0 | 0 | 0 | 0 |
| AccessMedicine | 1,917 | 0 | 0 | 0 | 0 | 0 | 0 |