Sort bibliography, as citations: date descending

[karnesky]

As reported in email from Carsten Allefeld.

[rmzelle]

Confirmed. From http://www.elsevier.com/journals/biological-conservation/0006-3207/guide-for-authors#68000:

"Groups of references should be listed first alphabetically, then chronologically.
Examples: 'as demonstrated (Allan, 2000a, 2000b, 1999; Allan and Jones, 1999). Kramer et al. (2010) have recently shown ....' "

[rmzelle]

Thanks!