Columbia subject headings:
Authors, Czech--20th century--Biography.
Ptáčník, Karel, 1921-2002--Friends and associates.
Ptáčník, Karel, 1921-2002.
Harvard subject headings:
Authors, Czech--20th century--Biography.
Authors, Czech--20th century.
Ptáčník, Karel, 1921-2002--Friends and associates.
Ptáčník, Karel, 1921-2002.
Princeton subject headings:
Authors, Czech--20th century--Biography.
Ptáčník, Karel, 1921-2002--Biography.
Ptáčník, Karel, 1921-2002--Friends and associates.