Seems to be working for me, anyway this is the url
http://delivery.acm.org/10.1145/2930000/2928278/a7-narayanan.pdf http://delivery.acm.org/10.1145/2930000/2928278/a7-narayanan...
Ah, might be because my institution has the acm subscription. This is the paper http://dl.acm.org/citation.cfm?doid=2928275.2928278 http://dl.acm.org/citation.cfm?doid=2928275.2928278.