Thonhauser, K.E. & Gutnick, T. & Byrne, R.A. & Kral, K. & Burghardt, G.M. & Kuba, M.J. (2013)
Social learning in Cartilaginous fish (stingrays Potamotrygon falkneri). Animal Cognition, 16(6), 927–932
DOI: 10.1007/s10071-013-0625-z

Kuba, M.J. & Byrne, R.A. & Burghardt, G.M. (2010)
A new method for studying problem solving and tool use in stingrays (Potamotrygon castexi). Animal Cognition, 13(3), 507–513
DOI: 10.1007/s10071-009-0301-5