@article{56890,
      author = {Pringsheim, Ernst G.},
      url = {http://library.usi.edu/record/56890},
      title = {Pure cultures of algae : their perparation &  maintenance.},
      publisher = {Hafner,},
      recid = {56890},
      pages = {119 p.},
      address = {New York,},
      year = {1967},
}