High incidence of infection of an undescribed microsporidium (Microspora) in the communal bee Andrena scotica (Hymenoptera, Andrenidae) R.J. Paxton, I. Fries, N.J. Pieniazek and J. Tengö Apidologie, 28 3-4 (1997) 129-141 DOI: 10.1051/apido:19970304