@article{391220,
      author = {Ultan, Lloyd,},
      url = {http://library.usi.edu/record/391220},
      title = {Music theory problems and practices in the Middle Ages and  Renaissance / [electronic resource] :},
      publisher = {University of Minnesota Press,},
      recid = {391220},
      pages = {xiv, 267 p. :},
      address = {Minneapolis :},
      year = {1977},
}