Kolkata doctor rape-murder case: CM Mamata says will handover case to CBI if Kolkata Police fail to crack by August 18 The HinduKolkata Doctor’s Rape-Murder Accused Posed As Cop, Said “Hang Me” On Arrest NDTV‘Heartbreaking’: Priyanka Gandhi demands strict action in Kolkata doctor murder case The Times of IndiaKolkata doctor rape-murder: Mamata Banerjee says if all accused not arrested by Sunday, case will be handed over to CBI The Indian ExpressKolkata Doctor Rape Case: How a Bluetooth earphone helped police catch the rapist civic volunteer Sanjay R The Economic Times