From References:
When professor Mermerski was lecturing at the Massachusetts University in the USA, he was invited to settle abroad. However, he categorically rejected this proposal.
"Bulgaria is the country where I feel best”, says Professor Mermerski. “I was born here, my friends are in Bulgaria and my children were born in this country. I worked for a long time abroad and I am still receiving invitations to work in other countries, but I have no desire to leave Bulgaria.”