Horvath, Edward P.; Ilka, Richard A.; Boyd, James; Markham, Thomas (1981). "Evaluation of the neurophysiologic effects of 1,2-propylene glycol dinitrate by quantitative ataxia and oculomotor function tests". American Journal of Industrial Medicine. 2 (4): 365–78. doi:10.1002/ajim.4700020407. PMID6980592.
Horvath, Edward P.; Ilka, Richard A.; Boyd, James; Markham, Thomas (1981). "Evaluation of the neurophysiologic effects of 1,2-propylene glycol dinitrate by quantitative ataxia and oculomotor function tests". American Journal of Industrial Medicine. 2 (4): 365–78. doi:10.1002/ajim.4700020407. PMID6980592.