Lorentz, R. A. H. (1991). Multivariate Birkhoff Interpolation.
Lua i Stíl Chicago (17ú heag.)Lorentz, Rudolph Alexander Henry. Multivariate Birkhoff Interpolation. 1991.
Lua MLA (8ú heag.)Lorentz, Rudolph Alexander Henry. Multivariate Birkhoff Interpolation. 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.