@article{Mazur:2016,
  author  = "J. Mazur and I. Tabak and A. Dzielska and K. Wąż and A. Oblacińska",
  title   = "The Relationship between Multiple Substance Use, Perceived Academic Achievements, and Selected Socio-Demographic Factors in a Polish Adolescent Sample",
  journal = "International Journal of Environmental Research and Public Health",
  volume  = "13 (12)",
  pages   = "1--13",
  year    = "2016",
}