C.-\ . Black. — Abrasion and érosion of thc teeth. (American

syst. of dentistry, Philadelphia, 1S8(3.) i'^.-C. KiRCK. — Erosion. (Intern. Dent. Journ., 1880.) Pkukv. — Erosion of the teeth. (Intern. Dent. Jour., 189i).) IJKUKMAN. — Abrasion der Zahne. (Dent. Vier. lahrsch for

Zahnheilk.,187i).) (1,-L. Snvukr. — Erosions as found in the Olrient. Cause and

Effect. (The Dental Review, 1898.)