@article{art1250,
  title = {Systematic Review on COVID-19 Vaccines: Comparative Study of AstraZeneca, Pfizer-BioNTech, Sputnik V, Johnson & Johnson, Moderna and Corona Vac.},
  doi = {10.23958/ijirms/vol06-i11/1250},
  url = {https://mail.ijirms.in/index.php/ijecs/article/view/1250}
}