@book{52,
  author = {Roy D. B. and Rothery Peter and Brereton Tom M.},
  title = {The design of a systematic survey scheme to monitor butterflies in the United Kingom.  In: Studies on the Ecology and Conservation of butterflies in Europe, vol 1. General concepts and case studies, pp. 102-105. Kuhn, E., Fieldmann, R. Thomas, J.A. and Se},
  year = {2005},
  month = {2005},
  publisher = {Pensoft},
  address = {Sofia},
  language = {eng},
}