1. Abeasis, S., Del Fra, A.: Young diagrams and ideals of pfaffians. Adv. Math. 35, 158–178 (1980)
2. Avramov, L.: A class of factorial domains. Serdica 5, 378–379 (1979)
3. Abbott, J., Bigatti, A.M., Robbiano, L.: CoCoA: a system for doing Computations in commutative algebra.
http://cocoa.dima.unige.it
4. Bruns, W., Herzog, J.: On the computation of
$$a$$
a
-invariants. Manuscr. Math. 77, 201–213 (1992)
5. De Negri, E.: Some results on Hilbert series and
$$a$$
a
-invariant of pfaffian ideals. Math. J. Toyama Univ. 24, 93–106 (2001)