@Test
    public void filtersByPublisherWorks2() {
        citations.add(c1);
        citations.add(c2);
        citations.add(cnull);
        filter.addFieldFilter("publisher", "Diktaattori");
        List<Citation> filtered = filter.getFilteredList();
        assertTrue(filtered.contains(c2) && filtered.size() == 1);
    }