author = { Heino, Aarre },

title = { The presentation of data with graduated symbols },

publisher = {Maantieteen laitos},

isbn = {9512908220},

keywords = { Daten , Präsentationsgrafik , Graphisches Symbol },

year = {1996},

abstract = {Aus: Cartographica 32:1 (1995)},

booktitle = {Turun Yliopiston Maantieteen Laitoksen julkaisuja ; 151},

address = { Turku },