Understanding Complex Systems, p. 75-109
DOI: 10.1007/978-3-540-75632-3_3
Handbook of Geomathematics, p. 1-23
DOI: 10.1007/978-3-642-27793-1_41-2
Handbook of Geomathematics, p. 2747-2772
DOI: 10.1007/978-3-642-54551-1_41
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