Krajinski, F., Martin-Laurent, F., Gianinazzi, S., Gianinazzi-Pearson, V., & Franken, P. (1998).
Cloning and analysis of psam2, a gene from Pisum sativum L. regulated in symbiotic arbuscular mycorrhiza and pathogenic root-fungus
interactions. Physiological and Molecular Plant Pathology, 52(5),
297-307. doi:10.1006/pmpp.1998.0156.