A new publication in the Journal of the Atmospheric Sciences:
Empirical formulation for multiple groups of primary biological ice nucleating particles from field observations over Amazonia by Sachin Patade , Vaughan T. J. Phillips, Pierre Amato, Heinz G. Bingemer, Susannah M. Burrows, Paul J. DeMott, Fabio L. T. Goncalves, Daniel A. Knopf, Cindy E. Morris, Carl Alwmark, Paulo Artaxo, Christopher Pöhlker, Jann Schrod, and Bettina Weber. J. Atmos. Sci., 2021.

The article can be accessed here.