2019
Rogov - about locks
    https://habr.com/ru/companies/postgrespro/articles/466199/
    https://habr.com/ru/companies/postgrespro/articles/465263/
    https://habr.com/ru/companies/postgrespro/articles/463819/
    https://habr.com/ru/companies/postgrespro/articles/462877/
2018
https://www.citusdata.com/blog/2018/02/22/seven-tips-for-dealing-with-postgres-locks/
    https://habr.com/ru/company/otus/blog/452986/
2015
https://habrahabr.ru/company/postgrespro/blog/270827/