The submission system for the special issue of Information and Computation derived from the conference is ready at
You should click on Submit New Manuscript and select there SI: LATA 2020.
We expect substantially extended papers. If the paper contains only the proofs of the results missing in the proceedings paper, that will not be accepted as an extended paper. There is no page limit, but please be conscious that the longer the paper, the less chances that reviewers accept to look at it.
We recommend to use already at this stage the guidelines provided by the journal:
The extended submission deadline is June 21.