| Pubs1 | Pats1 | Pubs2 | Pats2 | Permutation | Publications | Patents | Ratio |
| aclm/((("polymer electrolyte membrane" or pem) and ("fuel cells" or "fuel cell")) or pemfc) | 423 | 266 | 159.0% |
| Total Publications:423 Total Patents: 266 | Mean Ratio: 159.02% Standard Deviation: NaN% | Mean + StdDev: NaN Mean - StdDev: NaN% |