Unfortunately it is just something I have been told by other comrades. I did some digging to see if I could find anything for you but most of what I could find was too out of date and obviously ideological to recommend. There could be something of value in "The Political Economy of Romanian Socialism" by William E. Crowther but the introduction didn't give me an abundance of hope. The book was published by Praeger (connection to Dennis uncertain) in 1988 which is known for publishing books by Eastern Bloc dissidents. It's also, seemingly, Crowther's only book.

However, the introduction, while reeking of capitalist ideology, is genuinely well written and display critical thinking rooted in an obvious knowledge of social science. It's not a super long book and its on Anna's Archive if you're very curious. It could also cite some decent sources within it.

I also found a book called The Socialist Republic of Rumania by Stephen Fischer-Galati but it was published in 1969 and even the blurb of Annas-archive was so abysmal I wrote it off.

Never meant to imply it was bad or somehow worse than capitalism. The way it was presented to me was more that it wasn't as good as many other socialist experiments and had some particularly crummy policies here and there