@article{Fukuda1991, 
     author = "Fukuda, Komei and Saito, Shigemasa and Tamura, Akihisa", 
     doi = "10.1016/0166-218X(91)90066-6", 
     issn = "0166218X", 
     journal = "Discrete Applied Mathematics", 
     link = "http://www.sciencedirect.com/science/article/pii/0166218X91900666 http://linkinghub.elsevier.com/retrieve/pii/0166218X91900666", 
     month = "apr", 
     number = "2", 
     pages = "141--149", 
     title = "Combinatorial face enumeration in arrangements and oriented matroids", 
     uri = "http://www.sciencedirect.com/science/article/pii/0166218X91900666", 
     volume = "31", 
     year = "1991", 
}

Problems: 66