write to file method
collective author name is extracted
max id is lowered
validate if number of  pmids in the response the same as in query
collective authror - only one allowed
space as substitute removed
new rules for author list;
if there is collective author it is always listed last
convert citation to HTML representation
unix file format for new line \n only
files for testing
read file to string
\n is added after each part of abstract
tests of citation to html
new citation format
test res from file