Writing scientific papers is a difficult activities. Conventional wisdom suggests that it is not that easy to learn (and teach) how to write a good research paper, i.e., a paper with a clear statement of the problem being addressed, the proposed solution(s), and results achieved. It must describe clearly what has been done before on the problem, and what is new.
As a PhD student you should not underestimate the challenges that writing a research paper presents.
Not surprisingly, being able to write a good paper starts from the ability to read a paper. This is nice reading by S. Keshav, "How to read a paper". Below a list of useful pointers that might help you in this dauting task.
H. Schulzrinne. Writing Technical Articles
Writing Systems and Networking Articles
Markus Voelter. Notes on Technical Writing
Notes on Technical Writing
Donald E. Knuth, Tracy Larrabee, and Paul M. Roberts. Mathematical Writing
Juan de Lara. Scientific Writing
Dipartimento di Ingegneria e Scienze dell'Informazione e Matematica Università degli Studi dell'Aquila