18.1 A

Gisle Aas, Section 10.7

Michael Aivazis, Section 16.8

Kevin Altis, Section 7.16

David Ascher, Section 1.1, Section 1.18, Section 2.3, Section 3.18, Section 3.19, Section 4.17, Section 12.5, Section 12.6, Section 12.9, Section 14.11