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There are three main models of scientific publication:
1. In the conventional model, scientific articles are published in journals to which access is provided in return for payment by the user of the information. Libraries at higher education institutions, such as the Iscte Library, usually cover these costs, making the information available to the community.
2. When scientific articles are published in journals to which users can access free of charge, the model is known as open access publishing. In this case, authors publishing in these journals may have to pay a fee for the editorial processing of the article (APC – Article Processing Charges). Many journals, however, do not charge any publication fees.
You can find journals with no publication charges in your field of interest in the DOAJ Open Access Journal Directory, using the ‘Without article processing charges (APC)’ filter.

3. More recently, the hybrid model has been introduced, in which scientific articles are published in journals that operate under the conventional model, but which offer authors the option of publishing their article specifically as open access (usually subject to payment of an APC).
Explore an open access publication strategy by understanding its advantages. It allows you to give your publications greater visibility, making them potentially more citable and thereby increasing their scientific impact.
To select a high-quality journal for publication, follow these guidelines:
Check whether the journal undergoes a peer-review process and whether this is presented clearly and transparently.
Search scientific output evaluation databases to see if the journal is indexed.
Familiarise yourself with the journal’s scientific evaluation metrics.
Look within your field of research.
Examine the journal’s publication model.
Indexed journals are those listed in reference databases, such as Scopus or Web of Science, which are recognised for their rigorous selection of content, particularly with regard to the peer-review process and ethical considerations.
Find out about the journal selection criteria in Scopus
Find out about the journal selection criteria in Web of Science
Given that an indexed journal is assumed to be of high quality, to have an international scope and to meet all the necessary peer-review requirements, it is advisable to publish in one of these journals.
To find an indexed journal in the reference databases for your field of study, proceed as follows:
Scopus
Under ‘Sources’, search by subject area to select the area or sub-area most relevant to your research. You will be presented with a list of journals organised in descending order of their CiteScore impact factor.
You can use the ‘Display only Open Access journals’ filter to restrict your search to journals that offer open access publication.
You can also select only journals ranked in a specific quartile or the top 10 per cent of the list.
SCImago Journal & Country Rank
This is another tool for evaluating scientific output that uses the list of journals indexed in Scopus.
In the ‘All Subject areas’ and ‘All subject categories’ boxes, select the parameters of interest to you. You will retrieve a list of journals organised in descending order of the SJR (SCImago Journal Rank) impact indicator.
You can use the ‘Only Open Access Journals’ filter to restrict the search to journals that offer open access publication.
Scopus is included in the SCImago Journal & Country Rank, but the reverse is not true. Therefore, to obtain additional information that is freely accessible (for institutions that do not subscribe to the database), you can use the SCImago Journal & Country Rank; however, to ensure that the journal is listed in Scopus, you should check Scopus (sources).
Journal Citation Reports (Web of Science)
Browse the Web of Science categories to find your area of interest. Select the set of journals from the index of your choice (note that not all Web of Science indices provide an impact factor!).
In indices with an impact factor, you will see a list organised in descending order by this indicator (JIF – Journal Impact Factor).
In the filter box on the left, you can restrict your search to open-access journals and also group the list by quartile.
Do not publish in journals of dubious origin that do not meet all the requirements for a high-quality publication process.
The reality of predatory journals and publishers is complex. In most cases, submitted articles are published quickly, but at the expense of the quality of peer review. The absence of this process is critical because, ultimately, it can result in the reproduction of content that has not been validated by experts and its use in subsequent research, leading to what we might call pseudoscience!
The phenomenon also occurs in the case of conferences.
Find out more about this topic here.