Hi Maria,

I can suggest some pubblications. The first couple explains well both the common NGS (Illumina or 454...) as the new sequencing technologies such Pac-Bio:

http://www.annualreviews.org/doi/full/10.1146/annurev.genom.9.081307.164359

http://www.nature.com/nrg/journal/v11/n1/abs/nrg2626.html

To investigate the early sequencing techniques I suggest this link. It's not really exhaustive, but has all the links you need to deepen the topic:

http://www.nature.com/scitable/nated/article?action=showContentInPopup&contentPK=690

I hope this helped,

best

Thank you so much!!