Peacock JE, Herrington DA, Wade JC, Lazarus HM, Reed MD, Sinclair JW, Haverstock DC, Kowalsky SF, Hurd DD, Cushing DA, Harman CP, Donowitz GR. Ciprofloxacin plus piperacillin compared with tobramycin plus piperacillin as empirical therapy in febrile neutropenic patients. A randomized, double-blind trial. Ann Intern Med. 2002 Jul 16; 137(2):77-87.