APA (7th ed.) Citation

Poulsen, B. T. (1970). The medvedev lattice of degrees of difficulty. Aarhus Universitet, Matematisk Institut.

Chicago Style (17th ed.) Citation

Poulsen, Birgit Truust. The Medvedev Lattice of Degrees of Difficulty. Aarhus: Aarhus Universitet, Matematisk Institut, 1970.

MLA (8th ed.) Citation

Poulsen, Birgit Truust. The Medvedev Lattice of Degrees of Difficulty. Aarhus Universitet, Matematisk Institut, 1970.