@Article{ ROSALES_Branco:1690-1697,
author = { JOSE CARLOS ROSALES GONZALEZ and Manuel B. Branco } ,
title = { Two-Extension of a Numerical Semigroup with Embedding Dimension Two },
journal = { Communications in Algebra },
year = { 2014 },
volume = { 42 },
pages = { 1690-1697 },
doi = { http://www.tandfonline.com/doi/abs/10.1080/00927872.2012.748781#.VJQjJB0MA },
}