1. abo H. Abo, Macaulay 2 scripts for finding rational surfaces in ℙ⁴ with degree 12. Available at \url{http://www.math.colostate.edu/ abo/programs.html}.
2. as H. Abo and F.-O. Schreyer, Exterior algebra methods for the construction of rational surfaces in ℙ⁴, in preparation.
3. Algebraic vector bundles on 𝑃ⁿ and problems of linear algebra;Bernšteĭn, I. N.;Funktsional. Anal. i Prilozhen.,1978
4. Construction of surfaces in 𝑃₄;Decker, Wolfram;J. Algebraic Geom.,1993
5. Sheaf algorithms using the exterior algebra;Decker, Wolfram,2002