If you're interested in the content type "H Extremo" offers, you might also consider:
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Be cautious of:
| Tool | How to Use | Why It Helps | |------|------------|--------------| | ( scholar.google.com ) | Search "Revista H Extremo" Enero 2013 | Scholarly citations sometimes link to PDFs hosted on university servers. | | BASE (Bielefeld Academic Search Engine) | base-search.net – same query | Indexes millions of open‑access documents, including gray literature. | | OpenAIRE | www.openaire.eu – search by title | European research portal that may have harvested the PDF if it was ever deposited in an open repository. |
When you finally locate the PDF (or confirm it’s not freely available), note: