Nowakowska , D., K. Nowomiejska, and R. Rejdak. “The Use of Heads up Surgery in Cataract Surgery and Vitrectomy”. OphthaTherapy. Therapies in Ophthalmology, Vol. 4, no. 2, June 2017, pp. 93-97, doi:10.24292/01.ot.300617.04.