The contents published by ASPG e.g., journals and papers, are now registered with Crossref. That means, the meatadat of all published work at ASPG are available at Crossref content registration.
Crossref (formerly styled CrossRef)is an official Digital Object Identifier (DOI) Registration Agency of the International DOI Foundation. It is run by the Publishers International Linking Association Inc. (PILA) and was launched in early 2000 as a cooperative effort among publishers to enable persistent cross-publisher citation linking in online academic journals.