Rājamārtaṇḍa or Bhojavṛtti

vṛttiḥ --- tatra tasmin pradeśe yatra cittaṃ dhṛtaṃ tatra pratyayasya jñānasya yā ekatānatā visadṛśapariṇāmaparihāradvāreṇa yadeva dhāraṇāyāmavalambanīkṛtaṃ tadavalambanatayaiva nirantaramutpattiḥ sā dhyānamucyate ||2||