Eckhard Hitzer, THREE-DIMENSIONAL QUADRICS IN HYBRID CONFORMAL GEOMETRIC
Abstract: Three dimensional quadrics can be represented in extended conformal geometric algebras (CGA) in several ways. Most recently double CGA (DCGA) and quadric CGA (QCGA) have been proposed (For further literature see the references in [1). Due to space limitations in this abstract only the elegant algebraic core struc-ture of QCGA is presented in some detail, whereas the presentation in  focused on ease of programming and computational efficiency.
Source: https://www.ime.unicamp.br/~agacse2018/abstracts/InvitedSpeakers/Hitzer-2018-07-09.pdf, 07 Sep. 2018.