J Am Vet Med Assoc. 2003 Jun 1;222(11):1576-81. doi: 10.2460/javma.2003.222.1576.
PMID:12784966
The Whitaker test.
Johnston RB, Porter C.
Urol J. 2014 Jul 8;11(3):1727-30.
PMID:25015627
Antegrade pyelography versus unenhanced multidetector CT in the assessment of urinary-tract stones after percutaneous nephrostomy insertion: a prospective blinded study.