https://www.ncbi.nlm.nih.gov/nlmcatalog/100961733
Mertensiella. - NLM Catalog - NCBI
Catalog of books, journals, and audiovisuals at the National Library of Medicine.
nlm catalogmertensiellancbi
https://sco.wikipedia.org/wiki/Mertensiella?action=edit&redlink=1
Makin Mertensiella - Wikipedia
makinmertensiellawikipedia