A scientific note on long-term stability of a home-made oxalic acid water sugar solution for controlling varroosis Luciana Prandin, Nicoletta Dainese, Barbara Girardi, Ornella Damolin, Roberto Piro and Franco MutinelliApidologie, 32 5 (2001) 451-452DOI: https://doi.org/10.1051/apido:2001101