The APISAT 2018 Proceedings are available for free download for a period of one month from now on.
Anyone interested in it can access to it via:
https://link.springer.com/book/10.1007/978-981-13-3305-7.
The link will become invalid automatically from July 25, 2019.
After that, anyone wishes to purchase it shall order from:
https://www.springer.com/gp/book/9789811333040#aboutBook.