@misc{e2,
title= "Title 2 (April)",
year= 2011,
month = apr
}

@misc{e1,
title= "Title 1 (January)",
year= 2011,
month = jan
}


@misc{e3,
title= "Title 3 (December)",
year= 2011,
month= dec
}

@misc{f2b,
title= "Title 2 (f2b)",
year= 2010
}

@misc{f1,
title= "Title 1 (f1)",
year= 2010
}

@misc{f2,
title= "Title 2 (f2)",
year= 2010
}

@misc{f2a,
title= "Title 2 (f2a)",
year= 2010
}

%% now if we mix both
@misc{g1,
title= "Title (January)",
year= 2009,
month = jan
}


@misc{g2,
title= "Title (October)",
year= 2009,
month= oct
}

@misc{g2009b,
title= "Title (2009b)",
year= 2009
}

@misc{g2009a,
title= "Title 1 (2009a)",
year= 2009
}