@article{article, author = {ALBAYRAK BERAHİTDİN,SELAM SELİM OSMAN,YÜCE KUTLUAY,HELVACI MUSTAFA}, title = {Monitoring Possible Light Time Effect in the Orbital Period of Some Eclipsing Binaries at the Ankara University Observatory}, journal = {ASTROPHYSICS AND SPACE SCIENCE}, year = 2003, month = 2 }
Yayın ile ilgili açıklama girilmemiştir.
@inproceedings{inproceedings, author = {M.Helvaci}, title = {Visibility of the 10 mµ Silicate Feature In the Spectra of Objects Surrounded by Dus}, year = 1999, month = 4 }
@article{article, author = {BİLİR SELÇUK,AK TANSEL,DEMİRCAN OSMAN,HELVACI MUSTAFA}, title = {New absolute magnitude calibrations for detached binaries}, journal = {ASTRONOMISCHE NACHRICHTEN}, number = 835B, volume = 329 }