Determination of the minimum immersion time of Boophilus microplus (Canestrini, 1887) engorded females for in vito resistance tests with amitraz at 50% effective concentration (EC50) - Oliveira, R. O.; Mendes, M. C.; Jensen, J. R.; Bressan, Maria Cecília Reale Vieira (Revista Brasileira de Parasitologia e Veterinária, 2000)