1. Cryotherapy for Retinopathy of Prematurity Cooperative Group. Multicenter trial of cryotherapy for retinopathy of prematurity: preliminary results. Arch Ophthalmol 1988; 106: 471–9, and Pediatrics 1988; 81: 697-706.
2. The Committee for the Classification of Retinopathy of Prematurity. An international classification of retinopathy of prematurity. Arch Ophthalmol 1984; 102: 1130–4.
3. The International Committee for the Classification of the Late Stages of Retinopathy of Prematurity. An international classification of retinopathy of prematurity: II. The clas- sification of retinal detachment. Arch Ophthalmol 1987; 105: 906–12.
4. Palmer EA, Biglan AW, Hardy RJ. Retinal ablative therapy for active proliferative retinopathy of prematurity: history, current status, and prospects. In: Silverman WA, Flynn JT, eds. Retinopathy of Prematurity. Boston: Blackwell Scientific, 1985: 509–30.
5. Multicenter Trial of Cryotherapy for Retinopathy of Prematurity Cooperative Group. Manual of procedures. Springfield, Va, National Technical Information Service, US Dept of Commerce, NTIS Accession No. PB 88-163530. A copy may be obtained from the National Technical Information Service, US Department of Commerce, 5285 Port Royal Road, Springfield, VA 22151, (703)487-4650.