Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Q: Sentence: 'Jana , S.C. , Jung , C.D. , Dharaiya , D. , Jimenez , G. , Doing things right with chaotic mixing , paper presented at PPS-21 , Leipzig , Germany , June 19-24 , 2005 .', Argument/Subject 1: 'paper', Argument/Subject 2: 'june'
A: 
present at