Hussain, S., AL-Alak, M., & Shukur, G. (2014). Conditional Two Level Mixture with Known Mixing Proportions: Applications to School and Student Level Overweight and Obesity Data from Birmingham, England . International Journal of Statistics in Medical Research, 3(3), 298–308. https://doi.org/10.6000/1929-6029.2014.03.03.9