I have the following document
\documentclass[12pt,a4paper]{report}
\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{polyglossia}
\usepackage[maxlevel=3]{csquotes}
\usepackage{graphicx}
\usepackage[style=authoryear, language=french]{biblatex}
\setmainfont[Ligatures=TeX]{FreeSerif}
\setmainlanguage{french}
\setotherlanguage{english}
\usepackage{placeins}
\usepackage{setspace}
\onehalfspacing
When, for instance, I use the code:
\parencite{Boin2000} and \parencite{Boin2000b}
I get the following result:
Boin, 2000a and Boin, 2000b
But when I use the code:
\citeyear{Boin2000} and \citeyear{boin2000b}
I only get:
2000 and 2000
Boin2000 and Boin2000b are related to the following .bib document:
@Book{Boin2000,
Title = {The Politics of Environment},
Author = {Boin, Mathis},
Publisher = {Cambridge University Press},
Year = {2000},}
and
@Book{Boin2000b,
Title = {What is Environment},
Author = {Boin, Mathis},
Publisher = {Environment Policies Review},
Year = {2000},}
What should I do to also get the letters "a" and "b" that differentiate the two different references with \citeyear?