Separate citation numbers with commas and without any spaces. Indicate a sequence of three or more citation numbers as a single range separated by a hyphen.
The same effect was reported by [3,7,12].
Increasing emphasis has been placed on the rapid diagnosis of viral infections. Motion
or centrifugation can speed the diagnosis of some viral infections [19-22].
--Taniya Sarkar, Wei Zhao, and Nurul H. Sarkar, "Expression of Jun Oncogene in Rodent and Human Breast Tumors," World Wide Web Journal of Biology