| Naked eye observations for morning twilight at different sites in Egypt AH Hassan, YA Abdel-Hadi, IA Issa, NY Hassanin NRIAG Journal of Astronomy and Geophysics 3 (1), 23-26, 2014 | 19 | 2014 |
| Time verification of twilight begin and end at Matrouh of Egypt AH Hassan, NY Hassanin, YA Abdel-Hadi, IA Issa NRIAG Journal of Astronomy and Geophysics 2 (1), 45-53, 2013 | 14 | 2013 |
| The size distribution of HII regions as a new variant to determine the distances of galaxies IA Issa Astronomische Nachrichten, vol. 302, no. 5, 1981, p. 251-254. 302, 251-254, 1981 | 11 | 1981 |
| Brightness and color variation for evening and morning twilights at Bahria of Egypt IV AH Hassan, YA Abdel-Hadi, IA Issa, NY Hassanin NRIAG Journal of Astronomy and Geophysics 3 (1), 37-45, 2014 | 10 | 2014 |
| Naked eye determination of the dawn for Sinai and Assiut of Egypt AH Hassan, IA Issa, M Mousa, YA Abdel-Hadi NRIAG Journal of Astronomy and Geophysics 5 (1), 9-15, 2016 | 9 | 2016 |
| Eye Criteria and times of end and begin of twilights. Bahria/Egypt. III IA Issa, AH Hassan NRIAG J. Astron. Astrophys.(Special Issue), 413-423, 2008 | 9 | 2008 |
| A method for the determination of cosmic distances MA Sharaf, IA Issa, AS Saad New Astronomy 8 (1), 15-21, 2003 | 9 | 2003 |
| Distance estimate of M31 based on the size distribution of Hii regions and dark clouds IA Issa Astrophysics and space science 113, 317-323, 1985 | 8 | 1985 |
| Atmospheric transparency, twilight brightness and color indices at Kottamia of Egypt IA Issa, NY Hassanin, AH Hassan, YA Abdel-Hadi Red 4320 (5145), 7800, 2011 | 7 | 2011 |
| Transparency of the night sky at Bahria/Egypt, I IA Issa, AH Hassan NRIAG J. Astron. Astrophys.(Special Issue), 383-397, 2008 | 7 | 2008 |
| Evening and morning twilights at Bahria/Egypt. II IA Issa, AH Hassan NRIAG J. Astron. Astrophys.(Special Issue), 399-411, 2008 | 7 | 2008 |
| Astronomical research activities with the 74 inch telescope at Kottamia observatory IA Issa, AI Gamal El Din Third Asian-Pacific Regional Meeting of the International Astronomical Union …, 1986 | 7 | 1986 |
| On the dust content of nearby galaxies IAM Issa Astronomische Nachrichten 301 (4), 177-180, 1980 | 6 | 1980 |
| Statistical Gaussian Distribution Function as a Distance Indicator to Stellar Groups HI Abdel-Rahman, IA Issa, MA Sharaf, MI Nouh, A Bakry, AI Osman, ... Journal of The Korean Astronomical Society, vol. 42, issue 4, pp. 71-79 42 …, 2009 | 5 | 2009 |
| Naked Eye Estimates of Morning Prayer at Tubruq of Libya AH Hassan, YAF Abdel-Hadi, UA Rahoma, IA Issa Al-Hilal: Journal of Islamic Astronomy 3 (2), 75-98, 2021 | 4 | 2021 |
| The tree clustering technique and the physical reality of galaxy groups MA Sabry, IA Issa, H Abdelrahman, AA Shaker NRIAG Journal of Astronomy and Geophysics 1 (2), 81-86, 2012 | 4 | 2012 |
| Frequency Distribution of HII Regions Radii as a Distance Indicator HA Ismail, AE Alawy, AS Takey, IA Issa, HH Selim Journal of The Korean Astronomical Society, vol. 38, issue 1, pp. 7-12 38, 7-12, 2005 | 4 | 2005 |
| Distances of galaxies from the apparent size distribution of Dark Clouds. II-NGC 224, NGC 2841 and NGC 7331 AMI Osman, MS Ella, IA Issa Astronomische Nachrichten 303, 329-333, 1982 | 4 | 1982 |
| First record of Klein’s sole Synapturichthys kleinii (Osteichthyes: Soleidae) off the Syrian coast (eastern Mediterranean) M Ali, A Saad, M Fadel, I Issa, C Reynaud, C Capapé Journal of ichthyology 55, 918-921, 2015 | 3 | 2015 |
| Archimedes spiral and the surface distribution of dark clouds in M31, III IA Issa Astrophysics and space science 184, 227-234, 1991 | 3 | 1991 |
