@article{PenasRolan2009,
  author    = {Anselmo Pe{\~n}as and Emilio Rol{\´a}n},
  title     = {La superfamilia Pyramidelloidea Gray, 1840 (Mollusca, Gastropoda, Heterostropha) en {\´A}frica Occidental : 10. Addenda 2},
  volume    = {20},
  number    = {1},
  pages     = {1 -- 54},
  year      = {2009},
}