Found as Muhammad Qasim Pasta's solution here https://github.com/jkeirstead/scholar/issues/21
get_complete_authors(id, pubid, delay = 0.4, initials = TRUE)
a string containing the complete list of authors
a Google Scholar ID
a Publication ID from a given google Scholar ID
average delay between requests. A delay is needed to stop Google identifying you as a bot
if TRUE (default), first and middle names will be abbreviated
Muhammad Qasim Pasta
Abram B. Fleishman
James H. Conigrave