1. Bateson, 1972:49; emphasis in original
2. cf. section 2.3.3 on page 58
3. cf. section 2.4 on page 59
4. Glaser & Strauss, 1967:188; Strauss & Corbin, 1990:61-2
5. Prof. Dr. Pleitner pointed out this pragmatic yet operational method, which the author gratefully acknowledges (personal communication, 1996).