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01. AFANADOR A.J., AITSEBAOMO P., GERTSMAN D.R: Eye and head contribution to gaze at near through multifocals: the usable field of view. American journal of optometry and physiological optics 63 (3) S. 187 - 192 (1986)
01. AFANADOR A.J., AITSEBAOMO P., GERTSMAN D.R: Eye and head contribution to gaze at near through multifocals: the usable field of view. American journal of optometry and physiological optics 63 (3) S. 187 - 192 (1986)
