@article{Zemtsov2006,
  author    = {Alexander Zemtsov},
  title     = {Alexander von Humboldt's ideas on volcanism and their influence on Russian scientists},
  url       = {http://edoc.bbaw.de/oa/articles/reFAG1feEy6uQ/PDF/23Ea6ENcJXkOg.pdf},
  year      = {2006},
}