@misc {MATHEDUC.02437748,
    title        = {The Open University. Mathematics foundation course. Block 2: Functions and numbers. Unit 3. Functions and data. The Open University. Mathematik-Grundkurs. Block 2: Funktionen und Zahlen. Teil 3. Funktionen und Daten. (Open Univ., Milton Keynes (UK)).},
    howpublished = {1982. 48 p.},
    year         = {1982},
    msc2010      = {I28xx (I38xx)},
    identifier   = {1985g.05590},
}