L. Portigal

发表

Lisa V. Smith, S. Waterman, C. DeGiorgio, 2004, Emerging infectious diseases.

G. Visvesvara, A. Todd, M. Finn, 1986, American journal of public health.

Richard W. Carlson, Moshe Ben-Bassat, Max Harry Weil, 1980, IEEE Transactions on Pattern Analysis and Machine Intelligence.