Label-free darkfield-based technique to assist in the detection of Giardia cysts - Belini, Valdinei Luís; Freitas, Bárbara Luíza Souza; Sabogal-Paz, Lyda Patricia; Branco, Nilson; Franco, Regina Maura Bueno (Water, Air and Soil Pollution: an international journal of environmental pollution, 2018)