@article{UNY24122,
       publisher = {Departement of Mathematics Education Faculty of Mathematics and Natural Science  Yogyakarta State University},
           title = {Modified Genetic Algorithm to Solve Time-varying Lot Sizes 
Economic Lot Scheduling Problem},
         journal = {International Seminar on Innovation in Mathematics and Mathematics Education},
            year = {2014},
          author = {. Bethany Elvira 1 , Yudi Satria 2 , dan Rahmi Rusin   3},
             url = {http://eprints.uny.ac.id/24122/}
}