LP Salles; DW de Lima Monteiro (2010). "Designing the response of an optical quad-cell as position-sensitive detector". IEEE Sensors Journal. 10 (2). IEEE: 286–293. Bibcode:2010ISenJ..10..286S. doi:10.1109/jsen.2009.2033806.
LP Salles; DW de Lima Monteiro (2010). "Designing the response of an optical quad-cell as position-sensitive detector". IEEE Sensors Journal. 10 (2). IEEE: 286–293. Bibcode:2010ISenJ..10..286S. doi:10.1109/jsen.2009.2033806.
US patent 8783871, Pamplona, Vitor; Menezes de Oliveira, Manuel & Mohan, Ankit et al., "Near eye tool for refractive assessment", published 2013-01-31, issued 2014-07-22, assigned to Massachusetts Institute of Technology