Morawits, Hochrein. — Zur verhütung des akuten

herztods. Münch. Med. Woch, 1929; p. 1075,

Pr re

48. Mut A. -— La cuarta derivacion electrocardiografica. Revist. Ibero-ameri. de Cien. Med. Agost., 1933; vol. 8, p. 00-64.

49. Nieuwenhuizen C.-L.-C., Hartog H.-A.P. — Chest leads in electrocardiography. Archiv. of Internal. Medicine, March 1937; vol. 59, p. 448-473.

50. Nieuwenhuizen C.-L.-C., Hartog A.-P.-H. — The electrocardiogram in hypertension with special reference to

lead IV. Amer. Heart Jour, March 1937; vol. 13, n° 3, p. 308-330.

51. Ortega L. — Estudio de la IV derivacion, importancia de su investigacion en los casos de estenosis mitral.

Revis. Med. Cubana, Mayo 1934; vol. 45, p. 597-614.

92. Otto H.-L. — The ventricular electrocardiogram. An experimental study. Arch. of Inter. Med., 1929; vol. 43, p. 335.

53. Padilla T., Cossio D. — Utilidad de la IV derivacion en el diagnostico del-infarto del miocardio. Trabajos de la Catedra de Semiologia (Buenos-Aires), Prof. Padilla, 2° série, 1935; p. 75-88.

54. Rosenblum M.-D., Sampson M.-D. — Study of lead IV of the electrocardiogram in children with special reference to the direction of excursion of the T wave. Amer. Heart Jour., January 1936; vol. 11, n° 1, p. 49-53.

99. Ross C.-W., Ferguson D. — Electrocardiographic evidence of coronary occlusion with special emphasis on the use of the anterior-posterior chest-lead. U. S. Navy M. Bull, 1932; vol. 6, p. 1315.