Collection of high-quality samples in liquefiable soils using new sampling techniques - AJP; Viana da Fonseca; António Joaquim Pereira; C; Ferreira; Cristiana; FA; Molina-Gómez; Fausto Andrés; C; Ramos; Catarina (17th European Conference On Soil Mechanics And Geotechnical Engineering, Ecsmge 2019 - Proceedings, 2019)