Title:Simultaneous extraction and determination of four different groups of pharmaceuticals in compost using optimized ultrasonic extraction and ultrahigh pressure liquid chromatography-mass spectrometry
Title:Credit for low-income students and access to and academic performance in higher education in Colombia: a regression discontinuity approach / Impacto del crédito sobre el acceso y rendimiento académico de los estudiantes de bajos ingresos en la educación superior en Colombia: un enfoque de regresión discontinua