//-->
How valid can data fusion be?
Kiesl, Hans, (2006)
Theoretische und empirische Analysen zum Geldangebot in der Bundesrepublik Deutschland
Gräbel, Torsten, (2001)
Generalizations of the transportation model
Loh, Hooi-Tong, (1970)
Graph theory applied to transport network problems
Loh, Hooi-Tong, (1968)
Linear programming for management decisions
Loh, Hooi-Tong, (1971)