For some citations, I do not have page number or other information. For example, not all conference papers specify page numbers. When I do not enter these information, the reference shows up sloppy.
 Penner JE. Eects of soot aerosols from aircraft on cirrus cloud. In: DSVS International Workshop on Aviation. 2008,.
As seen, the reference finishes with
,. instead of simply
Another example is:
 Smith GP, Golden DM, Frenklach M, Moriarty NW,Eiteneer B, Goldenberg M, et al. GRI-Mech 3.0. http://www.me.berkeley.edu/gri_mech/; ????
As seen, the missing year appears as
Is there a way to let LaTeX know what parts are missing so it ignores that part. Obviously leaving that section blank does not work. I also cannot change the styling because this is the style for the journal that I am planning to submit my paper.