def sortkey(self, entry):
		result = entry.get_names().get_last_names()
		result.append(entry['year'])
		return result
return the first element of the underlying data as a python
dataset/ETHPy150Open dschwilk/bibstuff/bibstuff/bibstyles/shared.py/CitationManager.sortkey--crossover with--dataset/ETHPy150Open pydata/pandas/pandas/core/base.py/IndexOpsMixin.item