Art. 89 OG, Art. 90 OG, Art. 182 OG; admissibility of the federal remedy and time limits for complaints against cantonal decisions. A party who complains that a cantonal authority applied cantonal law instead of federal law cannot use the ordinary federal appeal where the statute requires another remedy; the incorrect choice of remedy is fatal to admissibility. In addition, the extraordinary complaint mechanism under Art. 182 OG is subject to a strict sixty-day period, which must be observed; expiry of the term leads to non-entry irrespective of the merits. The Federal Court examines admissibility ex officio and refuses to hear filings that are both procedurally misdirected and out of time.