| Name | Info | Provider | Link |
|---|---|---|---|
| Full text from DIGITALCSIC | free resource | Digital CSIC Spanish National Research Council | http://hdl.handle.net/10261/71056 |
| COPD | free resource | MedlinePlus Health Information | https://medlineplus.gov/copd.html |
| free resource | PubMed Central | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21678787/ | |
| free resource | Europe PubMed Central | https://europepmc.org/abstract/MED/21678787 | |
| free resource | EDP Sciences | https://publications.edpsciences.org/10.1051/parasite/2011182121 |