Ewart, J.C. (1895)
The lateral sense organs of elasmobranchs. I. The sensory canals of Laemargus. Transactions of the Royal Society of Edinburgh, 37(1), 59–86
DOI: 10.1017/S0080456800032518

Ewart, J.C. & Mitchell, J.C. (1895)
On the lateral sense organs of elasmobranchs. I. The sensory canals of the common skate (Raia batis). Transactions of the Royal Society of Edinburgh, 37, 87–105
DOI: 10.1017/S008045680003252X

Ewart, J.C. (1888)
The Electric Organ of the Skate. The Electric Organ of Raia radiata. Philosophical Transactions of the Royal Society of London, B, 179, 539–552
DOI: 10.1098/rstb.1888.0020

Ewart, J.C. (1888)
On the Development of the Electric Organ of Raia batis. Proceedings of the Royal Society of London (1854–1905), 44(1), 120–121
DOI: 10.1098/rspl.1888.0009

Ewart, J.C. (1888)
On the Structure of the Electric Organ of Raia circularis. Proceedings of the Royal Society of London (1854–1905), 44(1), 213–214
DOI: 10.1098/rspl.1888.0025