Fülöp Ferenc;  Sillanpää Reijo;  Dahlqvist Martti;  Pihlaja Kalevi;  Vainiotalo Pirjo: Ring-chain tautomerism and crystal structure of some 1,3-oxazacyclanes, and the electrophilic substituent constants for some heteroaryl groups in solution and in the gas-phase.
  HETEROCYCLES, 37 (2).  pp. 1093-1107.  ISSN 0385-5414 (1994)