It has been a pleasure to work with you since we submitted our draft last September, and I wanted to thank you for your help during all stages of the publication process. Please extend our gratitude to the whole EPJA team.

Manuel Zambrana, Institut fuer Kernphysik, University of Mainz, Germany

Dear Mr. Turci,
I would like to thank you very much for your immediate response and let you know that the paper is of excellent quality and that you may proceed to the publishing process.

Maria Diakaki, National Technical University of Athens, Greece

We are grateful to the referees for their very detailed review of our manuscript and for the important remarks and corrections. The referees are very nice experts of the subject of the paper. The manuscript has been revised with our pleasure. Thank you very much for the choice of the referees who were high level experts and kind scientists.

Avazbek Nasirov, Joint Institute for Nuclear Research, Moscow Region, Russian Federation

Thank you for the very fruitful and efficient collaboration. It has been a pleasure!!

Paul van Loosdrecht, Guest Editor Topical issue: Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials, 2013

I am naturally indebted to you and the referees who contributed to this success with your time and constructive advice.

Hamid Assadi

We are very thankful to you and our referee for your work! Especially we are thankful to the referee. His work has been done at a high professional level!

V. Uzhinsky, Joint Institute for Nuclear Research, Dubna, Russia

Thank you for the excellent service of EPJC during submission.

Anto Sulaksono, Universitas Indonesia, Depok, Indonesia

We are grateful to the Editor, to the Referee for careful reading of the manuscript, for the interesting and useful remarks, which allow us to improve the text and clarify some of the results.

Evgenij Martynov (Bogolyubov Institute for Theoretical Physics, Kiev, Ukraine) and Basarab Nicolescu (Babes-Bolyai University, Cluj-Napoca, Romania)

We thank you and the Editorial Office for the editorial work during the submission and revision of the manuscripts. We are particularly grateful to the Referee for his/her valuable work which has contributed improving the scientific content of the manuscripts.

Claudio Cremaschini and Massimo Tessarotto, Silesian University in Opava, Czech Republic

We sincerely thank the referee for his/her invaluable comments during the review process. We certainly consider EPJC for future submissions.

Phung Van Dong