Stanley, Richard (2007). "An introduction to hyperplane arrangements". Geometric Combinatorics. IAS/Park City Mathematics Series. Vol. 13. pp. 389–496. doi:10.1090/pcms/013/08. ISBN9780821837368.
Bhatnagar, Gaurav (1995). "Chapter I: A Characterization of Inverse Relations". Inverse relations, generalized bibasic series, and their U(n) extensions (PhD thesis). Ohio State University. p. 7. OhioLINKosu1487865929455351. ProQuest304230935. ResearchGate:228567824.
Bhatnagar, Gaurav (1995). "Chapter I: A Characterization of Inverse Relations". Inverse relations, generalized bibasic series, and their U(n) extensions (PhD thesis). Ohio State University. p. 7. OhioLINKosu1487865929455351. ProQuest304230935. ResearchGate:228567824.
researchgate.net
Bhatnagar, Gaurav (1995). "Chapter I: A Characterization of Inverse Relations". Inverse relations, generalized bibasic series, and their U(n) extensions (PhD thesis). Ohio State University. p. 7. OhioLINKosu1487865929455351. ProQuest304230935. ResearchGate:228567824.